ippon blade Q&A
Complete Overseas Edition
Part 1
Basic Understanding, History, Development Story, Track Record, and Body Theory
1. What is ippon blade?
Q. What is ippon blade?
ippon blade is a modern product reconstructed from Japan’s traditional one-tooth geta culture, adapted for contemporary body awareness and sports practice.
It is not something you simply wear.
It is designed to help you reconnect with your natural sense of balance by feeling the soles of your feet, your center of gravity, your axis, posture, breathing, and the connection of the whole body.
Modern bodies often lose the ability to sense force through the soles of the feet and finely adjust the center of gravity because of shoes, flat floors, and chair-based lifestyles.
ippon blade brings those lost sensations back through a single point of support.
Rather than moving the body by force, it teaches the sensation of moving naturally by harmonizing with gravity and shifting the center of mass.
Q. Is it different from traditional one-tooth geta?
ippon blade belongs to the category of traditional Japanese one-tooth geta, but it is different from conventional versions.
It is not simply a reproduction of historical one-tooth geta.
One-tooth geta have a long history in Japan, but their shapes have varied depending on region, maker, and purpose. There was never one unified design theory.
ippon blade has been redesigned based on the principle of standing on a single tooth, while considering:
the three-point arch of the foot
the functional center of the tarsal bones
center-of-mass movement
ground reaction force
whole-body connection
long-distance practice
application to sports
Although it looks similar to traditional one-tooth geta, the position of the tooth, the height, the ratio between the base and tooth, the strap structure, and the sole specification are all designed with their effects on the body in mind.
Q. Why is it called ippon blade?
“Ippon” comes from the Japanese word meaning “one.”
One tooth.
One axis.
One center line.
That meaning is contained in the name.
“Blade” literally means a sharp edge, but it is not meant in an aggressive way.
It means cutting away unnecessary tension and attachment in the body and mind, sharpening the central axis, and encouraging independence as a human being.
The name ippon blade carries the intention of bringing Japanese body culture to the world through a modern sports expression.
Q. Is it footwear or training?
It has aspects of both, but it is neither ordinary footwear nor ordinary training.
You wear it on your feet, but its purpose is not to make walking easier.
It is also not designed to exhaust the muscles.
ippon blade is a practice for relearning movement based on the body’s natural structure.
It does not give you something one-sidedly just by wearing it.
Instead, it allows you to feel how your own body stands, tilts, moves forward, and reorganizes itself.
Q. Why one tooth?
Because a single tooth awakens the body’s natural ability to make subtle adjustments.
Modern shoes have developed toward greater stability and protection.
That is convenient, but it also reduces opportunities for the soles of the feet to sense the ground and for the body to finely adjust its center of gravity.
With a single tooth, you cannot rely on a large surface.
As a result, the body naturally begins to:
sense
reorganize
connect
respond
The single tooth is not there simply to make you unstable.
It is a structure designed to bring back the body’s original adjustment ability.
Q. Why was ippon blade developed?
ippon blade was developed to help people relearn movement based on the structure of the body.
Modern people tend to focus too much on muscle strength, speed, and output.
But the body does not move by force alone.
Center of gravity.
Axis.
Breathing.
Sensation through the soles.
Ground reaction force.
Timing.
Whole-body connection.
When these elements are integrated, the body moves naturally.
ippon blade was created to restore that integrated sensation.
Q. What can I learn or develop with ippon blade?
The changes vary from person to person, but many users develop sensations such as:
a change in how they stand
a change in how they walk
clearer awareness of center-of-mass movement
sharper sensation through the soles
greater awareness of postural collapse
less unnecessary tension
a clearer sense of whole-body connection
a better ability to review the quality of sports movement
The important thing is not to acquire a special technique.
It is to recover, through sensation, how your body naturally moves.
Q. Who is ippon blade for?
ippon blade is suitable for a wide range of people:
runners
walkers
martial artists
fighters
dancers
yoga and Pilates practitioners
ball-sport athletes
people who want to improve body awareness
people who want to review posture and walking
people who want to restore foot sensation
people who want to reconnect with their own body
On the other hand, it is not suitable for people who are simply looking for something easy to walk in, or who expect results just by wearing it.
ippon blade is for people who are willing to have a dialogue with their own body.
Q. Can children use it?
Yes, children can use it.
However, they should always be supervised by an adult and begin in a safe place for a short period of time.
Children often absorb physical sensations quickly and can learn balance naturally through play.
However, they should not be forced to practice or compete.
For children, the most important thing is not fear, but developing body awareness through enjoyment.
Q. Can older adults use it?
Some older adults may be able to use it, but careful judgment is required.
Because there is a risk of falling, they should always begin in a place where they can hold onto support.
People with concerns about their legs or hips, osteoporosis, dizziness, neurological symptoms, or strong pain should not use it on their own judgment and should consult a professional when necessary.
For older adults, the basic starting point is not walking, but standing safely while holding support and feeling the center of gravity.
Q. Can I use it even without athletic experience?
Yes.
In fact, people with athletic experience sometimes compensate with muscle strength or habitual movement patterns.
ippon blade is not determined only by athletic ability.
What matters is not trying too hard to control the body by force, but sensing how the body responds.
Even without athletic experience, you can begin slowly and safely and feel changes in your own body.
Q. Is ippon blade used overseas?
Yes.
Orders and inquiries from overseas are increasing.
It is attracting attention not only from people interested in Japan’s unique one-tooth culture, but also from runners, martial artists, fitness professionals, and people interested in body mechanics and movement.
For overseas users, we provide English explanations, instruction videos, and safety guidance.
2. History of Japanese One-Tooth Geta
Q. Have one-tooth geta existed in Japan for a long time?
Yes.
One-tooth geta have existed in Japan for around 1,000 years as part of Japanese footwear culture.
However, there are several theories about their origin, and it is not possible to clearly state that one person or one specific school invented them.
They have been discussed in many contexts, including mountain spirituality, ascetic practice, folklore, martial culture, and daily life.
For this reason, one-tooth geta are not merely part of footwear history. They are deeply connected to the Japanese view of the body, nature, and mountain culture.
Q. Were they worn by yamabushi, Japanese mountain ascetics?
It has been passed down that yamabushi used one-tooth geta as part of their physical training.
However, this does not mean that yamabushi invented one-tooth geta.
It also does not mean that walking in one-tooth geta is formally defined as a required practice within Shugendo, Japan’s mountain ascetic tradition.
A natural understanding is that yamabushi used one-tooth geta as one form of training while strengthening the body and cultivating the mind in the mountains.
Q. Are they related to tengu?
One-tooth geta are widely known as a symbol associated with tengu.
Tengu are legendary beings connected with mountains, ascetic practitioners, and extraordinary physical ability.
In Japanese culture, tengu are not only seen as mythical beings, but also as symbols of mountain spirituality, martial skill, superhuman movement, and the balance between the human world and nature.
One-tooth geta have remained in Japanese culture as a symbol of this tengu-like body sense.
ippon blade reconstructs that symbolism as a modern body practice.
Q. Are they a formal tool of Shugendo practice?
Strictly speaking, one-tooth geta are not formally defined as part of the official training system of Shugendo.
However, it has been passed down that yamabushi and mountain practitioners used them as part of their own physical training.
So one-tooth geta are not Shugendo itself, but they are deeply connected to the image of mountain training, ascetic practice, and Japanese mountain spirituality.
ippon blade is not a religious practice.
It is a reconstruction of Japanese body culture in the context of modern sports and body awareness.
Q. Why has one-tooth culture remained?
Because one-tooth geta are not simply an unusual shape. They are a structure that strongly questions the body.
When you stand on one tooth, the body cannot hide.
The soles, axis, posture, breathing, and center of gravity reveal their imbalances directly.
That is likely why they remained as a form of training, practice, play, and body-awareness work.
They also continued to be remembered culturally because of their strong symbolic connection with tengu and mountain ascetics.
Q. Why did they become uncommon in modern life?
Modern society has moved toward convenience, safety, and uniformity.
Shoes became more cushioned and stable. Roads and floors became flat. Life became more efficient.
As a result, we have fewer opportunities to reorganize the body through instability.
One-tooth geta go in the opposite direction of convenience and efficiency.
That is why they became uncommon in modern daily life.
At the same time, they still hold the potential to restore body sensations that modern people have lost.
Q. Why reconstruct them now?
Modern bodies have become more convenient, but they have also become more likely to lose natural sensation.
The force felt through the soles.
The ability to finely shift the center of gravity.
The feeling of standing through an axis.
The ability to move without unnecessary force.
These are difficult to develop in modern shoes and modern living environments.
That is why it is meaningful to reconstruct the old structure of one tooth through modern body theory and sports practice.
ippon blade is not about simply preserving tradition.
It is about inheriting the principle.
3. The Development Story of ippon blade
Q. Who developed ippon blade?
ippon blade was developed by its founder, Ten Kodaira (Ten), together with Mokuen, a wood craftsman.
As a fitness trainer, Ten has spent many years teaching body movement while continuing practical research and experimentation using traditional one-tooth geta.
He has also completed multiple 100km ultramarathons in one-tooth geta himself, placing importance not only on theory, but on physical verification through real-world practice.
In addition, Ten co-developed ippon blade with Mokuen, a wood craftsman and barefoot runner. Together, they refined not only body sensation and movement concepts, but also woodworking techniques, structural precision, and material characteristics.
ippon blade was born through years of practice, prototyping, and continuous refinement.
Q. Why was it developed?
Traditional one-tooth geta had great potential, but their design and usage were not fully systematized.
Even if two products both have one tooth, the effect on the body changes greatly depending on the tooth position, height, and relationship between the base and the foot.
Ten felt that one-tooth geta needed to be redesigned not merely as old traditional footwear, but as something that could re-educate the modern body.
That is how ippon blade was born.
Q. How long did development take?
ippon blade was not completed from a single idea.
It reached its current form through years of instruction, practice, prototypes, improvement, and verification through marathon running.
The design was refined little by little through the process of running, walking, standing, teaching, selling, and observing how users changed.
Q. How many prototypes were made?
Rather than stating an exact number, what matters is that ippon blade was not created by chasing an external shape. It was refined by observing actual body responses.
ippon blade was not determined by appearance alone.
The height, ratio, tooth position, relationship with the sole of the foot, and the sensation during actual walking and running were all checked throughout the development process.
Q. Why use the golden ratio?
The 369 MIROKU model reflects the ideas of the Fibonacci sequence and the golden ratio.
The golden ratio is often associated with natural structures and growth patterns.
In ippon blade, the golden ratio is not merely about visual beauty.
Instability and harmony.
Height and contact.
Support and release.
Axis and flow.
It is used as a design philosophy to integrate these elements.
Q. Why is it called 369 MIROKU?
369 MIROKU is a name that combines symbolic numbers with structural harmony in the body.
369 carries a sense of circulation, harmony, creation, and universal order.
MIROKU carries the feeling of the future, harmony, and completion.
However, this is not meant as an object of religious worship.
ippon blade 369 MIROKU is named as a model with a golden-ratio-based structure that brings out a high level of body awareness.
Q. Why is it called 1000 ZEN?
1000 ZEN is a lower model that is closer to daily life and allows you to quietly face your body.
ZEN carries the meaning of releasing unnecessary tension and standing in the present moment.
The number 1000 carries a sense of completion, integration, stability, and expansion into everyday life.
1000 ZEN is not so much a model for intense challenge. It is a model for slowly sensing the center of the body again.
Q. What inspired the development?
At the root of the development was one question:
Can the body move more naturally?
A body that tries too hard.
A body fixed by muscle tension.
A body shaped from the outside by form.
Instead of that, could the body reorganize itself naturally through gravity, ground reaction force, axis, and sensation through the soles?
ippon blade began from that question.
Q. Why did Ten run ultramarathons?
To verify through his own body whether the theory was real.
For a short period of time, movement can sometimes be achieved through momentum or muscle strength.
But over a distance of 100 km, small errors in the way the body is used accumulate.
Tension, misalignment, forced contact with the ground, and disordered breathing cannot be hidden over long distance.
That is why ultramarathons became a place to verify the design philosophy of ippon blade.
Q. Why 100 km?
Because 100 km is a distance where the body cannot easily fake it.
It requires not only speed, but endurance, center-of-mass movement, ground contact, relaxation, mental state, fueling, concentration, and whole-body integration.
Running 100 km in one-tooth geta was not simply a performance.
It was a practice to confirm whether ippon blade truly harmonized with the body.
Q. Why emphasize real-world practice?
Because the essence of the body appears during actual movement.
Even if something can be explained while standing still, if it does not hold up in the reality of walking, running, fatigue, disorder, and recovery, it is not enough as a theory of the body.
ippon blade values not only appearance or explanation, but how the body actually responds when used.
Q. Why is theory alone not enough?
Because the body does not change through intellectual understanding alone.
Center of gravity, axis, ground reaction force, relaxation, and balance can all be explained in words.
But what truly matters is whether you can feel them in your body.
ippon blade is a practice that brings theory down into physical sensation.
4. Track Record and Reliability
Q. Can you really run in ippon blade?
Yes.
With ippon blade, it is possible not only to walk but also to run.
However, it is not something everyone can immediately run in like ordinary shoes.
Step-by-step practice and body awareness are necessary.
Running in ippon blade is not about kicking the ground with muscular force. It is about moving through center-of-mass shift and ground reaction force.
Q. Are there marathon results?
Yes.
The developer, Ten, has completed multiple 100 km ultramarathons in one-tooth geta.
In addition, ippon blade users and runners who have received instruction have practiced with it in marathons, ultramarathons, and daily running.
ippon blade is not merely a concept product. It has been verified through actual races and long-distance running.
Q. Is the 100 km completion real?
Yes.
The developer, Ten, has completed 100 km ultramarathons in one-tooth geta.
Main achievements include:
2017 Okuizumo 100 km Ultra
2018 Hakusan-Shirakawago 100 km Ultramarathon
2022 Tobishima Kaido Ultramarathon
These achievements show that the philosophy and design of ippon blade are not limited to short-term performance, but can withstand long-distance practice.
Q. Are there user achievements?
Yes.
ippon blade users include people who practice in marathons, ultramarathons, daily running, sports training, body instruction, yoga, martial arts, and fitness.
There are also instructors and experienced users who have continued using ippon blade for years and deepened their body awareness.
Q. How many pairs have been sold?
As of 2025, approximately 2,500 ippon blade units have been sold.
We have not expanded simply for the sake of sales volume.
We have delivered ippon blade carefully to those who need it, while valuing safety, usage guidance, instruction, support, and the brand philosophy.
It is not a temporary trend. Over the years, it has spread among practitioners, instructors, runners, and people interested in body awareness.
Q. Is there overseas activity?
Yes.
Orders and inquiries from overseas are increasing.
Runners, martial artists, fitness professionals, and people interested in body mechanics overseas are beginning to show interest in ippon blade.
We also provide an international online shop, English guidance, instruction videos, and safety information.
Q. Why do other one-tooth products have fewer marathon results?
To run long distances on one tooth, it is not enough to simply have the shape of one tooth.
The position of the tooth, the height, the ratio, the relationship with the foot, strap stability, and sole durability are all extremely important.
Also, the developer and maker must understand and embody how the body moves.
ippon blade was developed by someone who has embodied one-tooth geta practice and refined it through long-distance experience, so theory and practice are connected.
Q. Why emphasize real-world performance?
Because the essence of the body appears when it actually moves.
There are things you cannot understand by standing still.
There are things you understand only by walking.
There are things you understand only by running.
There are habits that appear only when you are tired.
ippon blade values not only how it looks or how it is explained, but how the body actually responds when using it.
5. Body Structure and Theory
Q. Why does the body change?
Because ippon blade gives the body a question.
Since the body cannot rely on a large contact surface, it naturally tries to balance itself.
At that moment, not only the soles of the feet, but also the:
ankles
knees
hips
pelvis
spine
shoulders
neck
head
begin to connect.
The body balances not as separate parts, but as a whole.
As a result, the way you stand, walk, hold posture, and apply force begins to change.
Q. Why does the way I walk change?
In ordinary walking, people often unconsciously kick the ground or try to move forward using only the legs.
With ippon blade, kicking strongly creates instability.
So the body naturally begins to search for a way to move forward by shifting the center of mass.
Instead of pushing with the feet to move forward, the center moves first, and the feet are carried as a result.
As this sensation develops, walking itself begins to change.
Q. Why does posture change?
Posture is not something created only by external form.
It is determined by the position of the center of gravity, the sensation through the soles, the flow of the axis, breathing, gaze, and the overall tension state of the body.
When you stand on ippon blade, postural collapse becomes easier to feel.
Rounded back, excessive arching of the lower back, left-right imbalance, shoulder tension, and stiff knees become easier to notice.
That awareness becomes the first step toward postural change.
Q. Why does it feel like floating?
With ippon blade, the body experiences the sensation of the center of gravity being lifted by ground reaction force and moved by the tilt of the axis.
This does not mean being disconnected from the ground.
Rather, it is a state where the body feels light while remaining deeply connected to the ground.
Instead of pressing down by force, the body receives the force returning from the ground, and the center of gravity is carried naturally.
At that moment, you may feel both light and grounded at the same time.
Q. What is ground reaction force?
Ground reaction force is the force that comes back from the ground when the body applies force to it.
When we walk or run, we are always receiving force from the ground.
However, many people try to push into the ground using muscular force.
With ippon blade, pushing by force creates instability.
As a result, it becomes easier to receive the returning force from the ground through the whole body.
Q. What is center-of-mass movement?
Center-of-mass movement means the movement of the body’s center.
Walking, running, standing, and changing direction are all related to the movement of the center of mass.
With ippon blade, trying to move only the feet does not create stability.
The center moves first, and the body is carried as a result.
That order becomes easier to feel in the body.
Q. Why do I stop kicking?
Kicking produces strong output.
But on one tooth, the harder you kick, the more easily the axis becomes disturbed.
So the body naturally shifts from pushing strongly to moving through the center of mass.
Instead of kicking to move forward, the center moves and the body follows.
This is one of the major characteristics of ippon blade.
Q. Why does unnecessary tension decrease?
Because when the body tenses too much, subtle adjustment becomes difficult.
With ippon blade, the more you try to harden and control the body by force, the harder it becomes to balance.
So the body naturally begins to release unnecessary tension.
Of course, at first, fear may create tension.
But as you become accustomed to it, the difference between necessary and unnecessary force becomes easier to feel.
Q. Why do the toes start working?
The toes play an important role in balance adjustment.
In modern shoe-based life, people can stand and walk without fully using the toes.
With ippon blade, the entire sole needs to sense and respond, so the toes naturally begin to react.
However, the goal is not to grip strongly with the toes.
What matters is that the toes, soles, ankles, and whole body work together.
Q. Why does the foot arch work?
With ippon blade, the sole cannot rely on a large flat surface.
As a result, the three-point arch of the foot becomes easier to activate.
The foot arch is not merely a shape.
It is a structure that absorbs impact, transmits force, and adjusts the center of gravity.
ippon blade makes it easier to feel that arch function.
Q. What is the three-point arch of the foot?
The three-point arch of the foot refers to the support structure based on:
the heel
the ball of the big toe
the ball of the little toe
These three points allow the longitudinal and transverse arches of the foot to function.
The human foot is not a flat board.
It supports the body and transmits force through a three-dimensional arch structure.
Q. Where is the tooth positioned?
The tooth of ippon blade is positioned near the center of the three-point arch of the foot, close to the functional center of the foot.
More precisely, it is not directly under the talus alone, but near the center of the tarsal bones including the talus.
This position relates to the sense of axis connecting the sole, ankle, knee, hip, pelvis, and spine.
Q. Why say “tarsal center” rather than “under the talus”?
The talus is a very important bone, but the movement of the body is not determined by the talus alone.
The foot functions through the coordination of multiple bones.
For this reason, ippon blade values the expression “the center of the tarsal bones including the talus,” rather than simplifying it as “directly under the talus.”
This gives a more accurate understanding of the function of the whole foot.
Q. Why can one-point support create stability?
One-point support is not static stability.
It is stability created through continuous movement.
It is not stability by hardening, but stability by constant adjustment.
The human body is not originally meant to stand perfectly still.
It constantly balances through small movements.
ippon blade brings out this dynamic form of stability.
Q. What is balance?
Balance is not stopping.
It is not hardening the body so that it does not collapse.
True balance is the ability to keep adjusting in response to change.
With ippon blade, you learn that balance through the body.
Not hardening, but sensing.
Not controlling, but responding.
Not stopping, but reorganizing within flow.
That is balance in ippon blade.
Q. What is dynamic equilibrium?
Dynamic equilibrium is a state of maintaining harmony as a whole while constantly changing.
The body is the same.
Humans are not completely still when standing.
We make small movements, adjust the center of gravity, and continuously respond through muscles, joints, and sensory systems.
ippon blade makes this dynamic equilibrium easier to feel.
Q. How is it related to homeostasis?
Homeostasis is the body’s ability to maintain internal balance.
In ippon blade practice, the body constantly tries to restore balance.
If it collapses, it reorganizes.
If it becomes biased, it returns.
If it tenses, it releases.
If it stops, it flows again.
This repetition is related to the body’s self-regulating ability.
Q. Why is the axis important?
The axis allows the parts of the body to connect.
Without an axis, the feet, arms, hips, and other parts tend to work separately.
With ippon blade, you feel the center of the body through a single point of support.
A sense of one continuous flow from the soles of the feet to the head.
That is the axis.
Q. Why does the whole body connect?
Because balance is not taken only by the feet.
When the soles change, the ankles change.
When the ankles change, the knees change.
When the knees change, the hips, pelvis, spine, shoulders, neck, and head also change.
ippon blade makes this chain easier to feel.
The body is not a collection of separate parts. It is one whole.
Q. Why does body awareness change?
Because ippon blade awakens sensations that are usually unused.
With flat shoes, it is difficult to feel:
pressure through the soles
misalignment of the center of gravity
left-right imbalance
disordered breathing
shoulder tension
pelvic tilt
the influence of gaze
With one-point support, these become easier to notice.
Rather than saying body awareness changes, it may be more accurate to say that you become aware again of sensations that were already there.
ippon blade Q&A
Complete Overseas Edition
Part 2
Effects, Medical Perspective, Model Differences, Sizing, Usage, and Safety
6. Effects and Changes
Q. What kinds of changes can happen?
The changes people experience with ippon blade vary from person to person.
Commonly reported changes include:
a different way of standing
sharper sensation through the soles of the feet
changes in walking
greater awareness of postural imbalance
less unnecessary tension
clearer understanding of center-of-mass movement
a stronger sense of whole-body connection
improved concentration
a deeper awareness of how the body is used
However, ippon blade is not something that automatically “fixes” problems simply by wearing it.
Physical change depends on how it is used, how often it is practiced, the condition of the body, and how each person receives and interprets sensation.
What matters is not chasing effects, but carefully observing what your body feels and how it changes.
Q. Can it improve posture?
It may contribute to postural improvement.
However, ippon blade does not forcibly correct posture.
When standing on ippon blade, it becomes easier to notice shifts in the center of gravity, left-right imbalance, rounded posture, excessive lower-back arching, shoulder tension, and locked knees.
That awareness may help the body reorganize naturally.
Posture is not only an external shape.
It is connected to the soles of the feet, center of gravity, breathing, gaze, pelvis, spine, and head position.
ippon blade can become a trigger for feeling that overall connection.
Q. Can it help lower back pain?
ippon blade is not intended as a treatment for lower back pain.
Lower back pain can involve muscles, joints, nerves, internal organs, lifestyle factors, and psychological stress.
For that reason, we cannot claim that ippon blade cures lower back pain.
However, some people feel changes in how stress is distributed through the lower back as standing, walking, balance, and foot use change.
If pain is severe, accompanied by numbness, or acute in nature, discontinue use and consult a medical professional.
Q. Can it help bunions?
ippon blade is not intended as a treatment for bunions.
Bunions involve many factors, including bone structure, footwear, walking patterns, muscle balance, and genetics.
ippon blade may help some users revisit how they use their toes and soles.
However, it does not guarantee correction of deformity or symptom improvement.
If pain or severe deformity is present, consult a professional and proceed carefully within a safe range.
Q. Can it help with weight loss?
ippon blade itself does not guarantee weight loss.
However, changes in body awareness may lead to:
better posture
more walking
greater enjoyment of movement
more awareness during daily activity
less unnecessary tension
As a result, some people naturally become more physically active overall.
However, body weight is also affected by diet, sleep, lifestyle, and overall activity level.
Q. Will it make me faster?
ippon blade is not designed to directly increase speed.
It is also not intended to increase muscle output or explosiveness.
However, by revisiting center-of-mass movement, ground contact, relaxation, and whole-body coordination during running, the quality of movement may change.
The philosophy is not to chase speed first, but to improve the quality of movement itself.
Q. Will it improve jumping ability?
It does not guarantee increased jumping ability.
However, changes in foot sensation, center of gravity, axis, and the way the body receives ground reaction force may help users revisit the quality of jumping movement.
Jumping depends not only on leg strength, but also on whole-body coordination, timing, and the balance between relaxation and contraction.
ippon blade may help develop awareness of those elements.
Q. Can it improve sports performance?
ippon blade does not directly guarantee improved sports performance.
However, it allows users to revisit qualities common across many sports, including:
center-of-mass movement
sense of axis
ground contact awareness
balance adjustment
relaxation
reaction
whole-body coordination
Because of this, it can be applied to running, martial arts, combat sports, ball sports, dance, yoga, Pilates, and many forms of physical expression.
ippon blade does not directly teach sport-specific techniques.
It develops the foundational body awareness beneath them.
Q. Does it affect the mind?
Some people do feel mental or emotional changes.
When standing on ippon blade, attention naturally shifts toward the body in the present moment.
The sensation of the soles, breathing, center of gravity, sway, fear, and tension become more noticeable.
Standing while feeling these sensations may create a shift away from purely mental thinking and back toward embodied awareness.
However, ippon blade is not intended to treat mental health conditions.
It is a body-based practice that may help people become more aware of their current state.
Q. Can concentration change?
Possibly.
When standing on one tooth, it becomes difficult to remain stable while mentally scattered.
Attention naturally shifts toward:
the soles of the feet
breathing
center of gravity
gaze
body tension
As a result, some people find it easier to enter a focused state.
However, there is no need to force concentration.
What matters is quietly noticing the sensations of the body.
Q. Why do sensations become sharper?
Because information from the body that is usually overlooked becomes easier to perceive.
With flat shoes and floors, the shoes and ground absorb many imbalances.
With ippon blade, those imbalances appear directly as sensation.
Left-right differences.
Pressure through the soles.
Shifts in center of gravity.
Shoulder tension.
Locked knees.
Shallow breathing.
Disturbed gaze.
By noticing these signals, body awareness becomes sharper.
Q. Does it make it easier to enter “the zone”?
ippon blade does not guarantee entering “the zone.”
However, it may help create conditions where unnecessary thought and tension decrease, making it easier to focus on the natural flow of movement.
The zone is not something forced through effort.
It emerges when movement, awareness, breathing, and body sensation naturally align.
ippon blade may help prepare the body and clarify sensation as an entrance toward that state.
Q. Why does it feel meditative?
When standing on ippon blade, the body must continuously face balance in the present moment.
If attention drifts too much into past thoughts or future anxiety, the body’s response becomes duller.
Feeling the soles.
Feeling breathing.
Feeling the center of gravity.
Responding to sway.
This is different from seated meditation, but it can resemble meditation within movement.
ippon blade is also a practice for returning to the present through the body.
7. Medicine, Science, and Evidence
Q. Does ippon blade have medical effects?
ippon blade does not guarantee medical effects.
It is not intended to diagnose, treat, or cure disease or symptoms.
We cannot claim that it cures or improves lower back pain, knee pain, bunions, poor posture, mental distress, or other conditions.
However, some people experience changes in how they use and feel their body through changes in movement and body awareness.
It should be understood not as a medical treatment, but as a practice for relearning body movement.
Q. Is it a therapeutic device?
No.
ippon blade is not a therapeutic device or medical device.
It is a product intended to revisit body sensation, posture, center of gravity, balance, and movement.
People with pain or medical conditions should avoid forcing use based solely on self-judgment and should consult a doctor or qualified professional when necessary.
Q. Is there scientific evidence?
At present, there is not yet sufficient large-scale medical research specifically focused on ippon blade itself.
For that reason, its effects cannot currently be claimed as scientifically proven medical outcomes.
However, the concepts behind ippon blade are closely related to established principles in movement science and human function, including:
center-of-mass movement
foot sensation
ground reaction force
base of support
dynamic equilibrium
postural control
whole-body coordination
In addition, there is a large accumulation of practical evidence through marathons, ultramarathons, and daily practice by the developer and users.
Medical evidence and practical evidence should be considered separately.
ippon blade is not currently presented as a medically proven intervention, but as a product refined through physical practice and body awareness.
Q. Is it scientific?
ippon blade is not based on mystical assumptions.
It is grounded in concepts such as center of gravity, ground reaction force, foot structure, arches, postural control, and balance response.
However, this does not mean every aspect has been fully quantified or scientifically finalized.
The body is highly complex, involving sensation, experience, environment, psychology, and individual variation.
ippon blade values scientific perspectives while also emphasizing direct physical experience.
Q. How is it different from physical therapy?
Physical therapy is based on medical evaluation and is intended for rehabilitation, recovery, and treatment.
ippon blade is not a medical practice.
It is intended for body awareness and movement relearning rather than diagnosis or treatment.
It is not opposed to physical therapy.
In some cases, professionals may even use it as a complementary way to explore body awareness more deeply.
However, symptoms requiring medical judgment cannot be addressed through ippon blade alone.
Q. How is it different from barefoot movement?
Barefoot movement emphasizes sensing the ground directly and using the natural function of the feet.
ippon blade also values foot sensation and center-of-mass movement.
However, ippon blade is not intended simply to recreate barefoot conditions.
By intentionally creating instability through a single support point, it draws out the body’s adjustment ability.
Barefoot approaches emphasize direct ground contact across the whole foot.
ippon blade emphasizes axis, center of gravity, and ground reaction force through one-point support.
Q. How is it different from huaraches?
Huaraches use thin soles and straps to allow freer foot movement.
They are often used by people seeking a more barefoot-like running sensation.
ippon blade, on the other hand, is structured around sensing the body’s center, axis, and center-of-mass movement through a single tooth.
Huaraches preserve broad contact with the ground.
ippon blade concentrates contact into a single point, drawing out whole-body adjustment.
Their structures and purposes are fundamentally different.
Q. Why is ippon blade different from other one-tooth products?
Not all one-tooth products are the same.
Even a few millimeters of difference in tooth position changes the body’s response.
Changes in height alter fear response, center-of-gravity behavior, and loading on the ankles and knees.
The ratio between the base and tooth, the relationship with the sole, strap stability, and sole quality are also important.
ippon blade is designed not around appearance, but around how the body responds.
Q. Why can’t shape alone reproduce the same experience?
Because the body responds to detail.
Even if two products appear similar, differences in:
tooth position
tooth height
base length
relationship to the foot center
strap angle
sole thickness
material stiffness
weight
stability while worn
all change the body’s response.
ippon blade is a structure refined through years of practice, prototypes, instruction, and marathon testing.
Simply copying the outer shape does not recreate the same body sensation.
8. Model Comparison
Q. What is 369 MIROKU?
369 MIROKU is the high model in the ippon blade series.
It is based on a Fibonacci golden-ratio design philosophy, using height and instability to draw out a deeper sense of axis and center-of-gravity adjustment.
Its characteristics include:
a stronger sense of elevated center of gravity
intense balance stimulation
fine body adjustment
application to running and dynamic movement
clear awareness of tension and release
Because it has a higher difficulty level, careful practice is necessary.
Q. What is 1000 ZEN?
1000 ZEN is the low model in the ippon blade series.
It is based on a traditional Japanese proportional concept and is suitable for daily movement and slower body practice.
Its characteristics include:
lower height and a greater sense of security
easy integration into daily movement
beginner-friendly use
careful development of foot sensation
clear perception of contraction and release
greater awareness of force control
For beginners or people who want to develop body awareness gradually, 1000 ZEN is often recommended.
Q. What is MUNI?
MUNI is a more unique model within the ippon blade series.
As the name suggests, it represents a state before separation into duality — a condition beyond opposition.
It is designed to help users feel left-right imbalance, tension and relaxation, stability and instability, and the relationship between body and ground.
MUNI is not simply a harder model.
It represents a deeper expression of the ippon blade philosophy.
Q. Which model is best for beginners?
In many cases, 1000 ZEN is recommended for beginners.
Its lower height and closer relationship to everyday movement make it easier and safer to begin with.
369 MIROKU offers stronger stimulation and more dramatic shifts in body sensation, but it also increases fear response and fall risk.
As a general guide:
If you want to begin safely
improve standing and walking
practice slowly
integrate it into daily movement
1000 ZEN is usually recommended.
If you already have strong body awareness
want to explore running or dynamic movement
seek a stronger sense of axis
want to challenge advanced balance
then 369 MIROKU may be appropriate.
Q. Which model is safest?
1000 ZEN is generally the easiest and safest model to begin with.
Because it is lower to the ground, fear response and fall risk are reduced.
However, there is still a possibility of falling.
Always begin in a safe place with support available.
Q. Which model is the most difficult?
Generally, 369 MIROKU is considered more difficult.
Because of its height, changes in center of gravity become more pronounced, requiring finer body adjustment.
However, difficult does not mean better, and easier does not mean inferior.
1000 ZEN also contains its own depth and subtlety.
Choosing based on purpose is most important.
Q. Which model is best for daily use?
For daily practice, 1000 ZEN is generally more suitable.
Its lower structure and stable feeling make it easier to integrate into slow movement and indoor practice.
However, it is not intended to replace ordinary shoes for long-distance walking.
It is best used in shorter sessions for body awareness practice.
Q. Which model is best for running?
For running applications, 369 MIROKU is the symbolic model.
Its height makes center-of-mass movement, ground reaction force, and axis tilt easier to perceive, helping users revisit the quality of running.
However, beginners should not start by running immediately.
First learn to stand, walk, and move slowly.
Q. Why are the heights different?
Because different heights create different stimuli for the body.
A higher model raises the center of gravity, making even small shifts feel larger.
This sharpens awareness of axis and center-of-mass movement.
A lower model feels closer to the ground, safer, and more connected to everyday movement.
Height is not merely design. It fundamentally changes body sensation.
Q. Why is proportion important?
In ippon blade, the relationship between the base, tooth, height, and foot is essential.
Where the tooth is placed.
How high it is.
How long the base is.
How it relates to the center of the foot.
These proportions change how the body responds.
Without balanced proportions, the result is simply instability.
When the proportions are balanced, harmony emerges within instability.
Q. Why do millimeters matter?
Because the sole of the foot and the center of gravity are extremely sensitive.
Even a slight shift in tooth position changes body response.
If it is too far forward, users rely too much on the toes.
If it is too far back, weight remains toward the heel.
If it is too high, fear response increases.
If it is too low, the stimulation becomes weaker.
ippon blade pays close attention to these subtle differences.
9. Sizing and Choosing the Right Model
Q. How do I choose the right size?
The best way is to choose based on your actual foot length.
Rather than relying only on your regular shoe size, we recommend measuring your bare foot length directly.
The ideal size allows your foot to sit securely on the platform without excessive overhang at the front or back.
If you are unsure, consult the official shop or a certified instructor with your foot measurements, regular shoe size, and intended use.
Q. Can I just use my normal shoe size?
It is safer not to rely only on standard shoe sizing.
Shoe sizes vary significantly depending on the brand and shape.
Even if two shoes are both labeled the same size, the actual foot length they fit may differ.
With ippon blade, the relationship between the foot and the platform is important.
Please measure your bare foot length before choosing a size.
Q. Should I choose a larger or smaller size?
In general, neither oversized nor undersized models are recommended.
If the platform is too large, the relationship between the center of the foot and the tooth becomes less accurate.
If it is too small, the foot becomes unstable and difficult to stand on comfortably.
What matters most is that the structure aligns correctly with the center of your foot.
If unsure, consult based on your measurements and intended use.
Q. Are international sizes supported?
Yes.
International sizing support is available.
Because shoe sizing systems differ between countries, it is best to use foot length in centimeters as the main reference.
The official shop provides general size guidance.
If uncertain, contact support with your foot measurements, normal shoe size, and intended use.
Q. Can people with wide feet use ippon blade?
In many cases, yes.
However, people with very wide feet or high arches may experience differences in strap fit and platform feel.
For users with especially wide feet, a larger size may sometimes be recommended.
Q. Are children’s sizes available?
Children’s sizes are currently available only within Japan.
Because children grow quickly, proper sizing and safety supervision are especially important.
Children should always use ippon blade under adult supervision in a safe environment and for short periods.
Adult users with small feet are generally not recommended to use children’s sizes, because the platform width is narrower and may increase fall risk.
10. Wearing and Practice
Q. How do I wear ippon blade?
Place your foot through the strap so that the toes and heel extend from the platform in roughly balanced proportions.
The center of the sole should align naturally with the structure of the platform.
At first, avoid gripping aggressively with the toes.
Instead, try to receive sensation through the entire sole of the foot.
Do not begin walking immediately.
Start by standing in a supported area and feeling the left-right balance of your center of gravity.
Q. How tight should the straps be?
The straps should be neither too loose nor too tight.
If too loose, the foot becomes unstable.
If too tight, discomfort and circulation issues may occur.
The ideal fit keeps the foot stable on the platform without strong pain in the toes or top of the foot.
At first, practice only for short periods while adjusting gradually.
Q. Why is it difficult at first?
Because it uses sensations that most people no longer use regularly.
Modern shoes allow people to walk without fine control from the soles and toes.
With ippon blade, the entire body must participate in balance.
Feeling difficulty at first does not mean the body is broken.
It often means dormant sensations are beginning to wake up again.
Q. What should I do first?
At first, do not try too hard to “hold still.”
In a safe environment, lightly touch a wall or railing and begin with small stepping motions in place.
While doing this, notice:
pressure through the soles
left-right differences
breathing
gaze
shoulder tension
knee condition
As you become more comfortable, slowly shift your center of gravity forward, backward, left, and right.
Walking comes afterward.
Q. How much should I practice?
At first, just a few minutes per day is enough.
There is no need for long sessions.
Even short practice can be effective if done carefully.
Gradually increase time as your body adapts.
If pain, strong fatigue, or instability appears, stop immediately.
Q. Should I use it every day?
Not necessarily.
What matters is not long duration, but careful awareness.
Even short but consistent practice can gradually develop body sensation.
However, on days when you are exhausted, unwell, or unable to focus, do not force practice.
Q. Can I use it outdoors?
Yes, but choose the environment carefully.
Use only on flat and safe surfaces away from cars, bicycles, and crowds.
Avoid steps, gravel, wet surfaces, steep slopes, and dark areas.
Beginners should first practice indoors or in safe outdoor spaces.
Q. Can I use it in the rain?
Rainy conditions are not recommended.
Wet surfaces become slippery and increase fall risk.
Water can also place stress on the wood and sole materials.
If the product becomes wet, dry it naturally in a well-ventilated area away from direct heat or strong sunlight.
Q. Can I run with it?
Yes.
However, beginners should not begin by running immediately.
Start with standing, stepping in place, walking, and slowly feeling center-of-mass movement.
Running with ippon blade requires gradual practice and sufficient body awareness.
Running with ippon blade is completely different from running in ordinary shoes.
Q. Are stairs dangerous?
Yes.
Especially for beginners, stairs should be avoided completely.
Changes in height make balance much more difficult and increase fall risk.
Even experienced users must approach stairs carefully.
Beginners should avoid stair use unless under direct instruction from a certified instructor.
Q. Should it be worn barefoot?
In general, barefoot use is recommended.
Bare feet allow clearer sensation through the soles.
However, people unfamiliar with traditional straps may initially experience rubbing or discomfort.
Begin with short sessions.
Q. Can I wear socks?
Ordinary socks that separate neither the toes nor the big toe are not recommended.
Traditional split-toe socks or tabi-style socks should be used instead.
Because barefoot and socked sensations differ, choose whichever method best suits your body.
11. Safety and Precautions
Q. Is it dangerous?
Because ippon blade is more unstable than normal shoes, there is a risk of falling.
For that reason, it is important to begin in a safe environment and for short durations.
ippon blade uses instability to develop body awareness.
It is not something to use recklessly.
Proper understanding and gradual progression are essential.
Q. Can I fall?
Yes.
Falls are possible.
Risk increases especially for beginners, when tired, distracted, rushed, or practicing on slippery surfaces.
Always begin near a wall, railing, or support.
If you feel uncertain about balance, learning from a certified instructor is recommended.
Q. What should beginners be careful about?
Beginners should avoid:
walking immediately
running immediately
using it on steps
using it on slippery surfaces
using it in crowds
using it for long periods
ignoring pain
continuing when exhausted
At first, simply standing and stepping in place near support is enough.
Q. What precautions apply to children?
Children should always be supervised by adults.
While ippon blade can become an enjoyable way to explore balance, there is also fall risk.
Do not force long practice sessions or create competitive pressure.
Start safely and briefly.
Q. What precautions apply to older adults?
Older adults should be especially careful because falls may lead to injury.
Begin only with supported standing.
Do not force walking practice.
People with osteoporosis, dizziness, neurological symptoms, or severe pain should avoid use or consult a professional beforehand.
Q. What if I get injured?
Stop use immediately.
If pain, swelling, numbness, or discomfort occurs, do not continue.
Seek medical attention when necessary.
Ignoring pain is not the same as developing body awareness.
Q. Where should ippon blade NOT be used?
Do not use in:
wet areas
slippery surfaces
gravel
steep slopes
stairs
crowded areas
roads with traffic
dark places
unstable floors
after drinking alcohol
Only use in environments where safety can be maintained.
Q. Can I use it after drinking alcohol?
No.
Alcohol reduces judgment, reaction speed, and balance, greatly increasing fall risk.
Q. Can it be used during pregnancy?
Use during pregnancy is not recommended because of fall risk.
Pregnancy also changes center of gravity and joint condition.
Anyone considering use during pregnancy should first consult a medical professional.
Q. What if I have a medical condition?
If you have a medical condition, do not force use based solely on self-judgment.
Especially if you have:
dizziness
neurological symptoms
osteoporosis
severe lower back pain
knee pain
hip pain
ankle instability
heart conditions
balance-related disorders
consult a doctor or qualified professional beforehand.
Q. What does “use at your own responsibility” mean?
It means the user is responsible for monitoring safety and adjusting use according to their own body condition.
Do not force practice.
Do not use in dangerous environments.
Do not ignore pain.
Do not skip progression steps.
Do not overestimate your limits.
Personal responsibility does not mean neglect.
It means carefully respecting your own body and safety.
Part 3
Pricing, Overseas Sales, Instructor System, TENARI, Philosophy, Misunderstandings, Community, and Maintenance
12. Pricing and Sales Philosophy
Q. Why is ippon blade expensive?
ippon blade is not priced as a simple wooden sandal.
The price reflects not only materials, craftsmanship, processing, and inspection, but also years of development, physical practice, teaching experience, safety management, support systems, brand operation, and accumulated body culture.
At first glance, a one-tooth sandal may appear to be just a wooden platform with a single tooth attached.
However, ippon blade is designed around:
tooth position
platform proportions
height
materials
strap structure
sole construction
relationship with the sole of the foot
specialized woodworking craftsmanship
real-world testing
instruction systems
safety standards
ongoing support
The goal is not cheap mass production.
The priority is delivering something that can responsibly interact with the human body.
Q. How long does production take?
Production and shipping times vary depending on inventory and order details.
If stock is available, items are shipped after inspection and preparation.
Custom orders, special sizing, or overseas-specific requests may require approximately one month for production.
For overseas and custom-sized orders, additional shipping time after completion may require another one to three weeks.
Please check the product page or order confirmation for estimated production and delivery times.
Q. Why not mass-produce it?
Mass production might lower costs and increase speed of distribution.
However, ippon blade is not something that should simply spread in large numbers without understanding.
Incorrect use increases fall risk.
Using it without understanding body movement can create misunderstanding.
If only the shape spreads, the philosophy and safety are lost.
For that reason, the focus is on carefully delivering it with proper information and support.
ippon blade is not a product built only around sales volume.
It is intended to grow as a body culture.
Q. Why not sell on Amazon?
Large marketplaces make products easier to access.
However, ippon blade is not an ordinary item that can safely be used immediately without explanation.
Sizing, strap adjustment, practice progression, usage environment, safety awareness, and instruction all matter.
For that reason, sales currently focus on the official shop and certified instructors.
This is not about restricting buyers.
It is about helping people begin safely and correctly.
Q. Why is resale discouraged?
Resale products may have unknown condition, usage history, sizing issues, or incorrect information.
There is also the possibility of counterfeit products, modifications, or hidden damage.
ippon blade directly affects body movement and balance.
It is not simply something that should be purchased only because it is cheaper.
Buying through unofficial channels may lead to:
lack of official support
incorrect sizing
uncertain safety condition
lack of proper instruction
increased accident risk
misunderstanding of usage
For these reasons, official purchasing channels are recommended.
Q. Why include instruction with sales?
Because how ippon blade is used is extremely important.
Starting correctly reduces fall risk and helps users develop body awareness more safely.
Especially for beginners, it is important to understand:
how to stand
how to sense center of gravity
strap adjustment
how to begin walking
unsafe usage patterns
differences between models
Instruction-supported sales are intended to help users begin safely and confidently.
Q. How are counterfeit products different?
Even if they look similar, they are fundamentally different from ippon blade.
ippon blade includes:
tooth position
height
platform proportions
relationship to the foot center
materials
strap structure
sole structure
manufacturing precision
real-world testing
instruction systems
safety information
Copying only the outer appearance cannot reproduce the same body sensation.
Counterfeit products also cannot guarantee safety, durability, or support.
Q. What is the serial number for?
Each ippon blade includes a serial number for product management.
This helps confirm authenticity and supports tracking, safety management, and customer support.
When products are acquired through unofficial channels, the serial number and purchase route help determine support eligibility and safety verification.
The serial number system exists to protect both the brand and the user.
Q. Why are used products not recommended?
The condition of used products is difficult to judge visually.
Wear to the wood.
Damage to the tooth.
Sole deterioration.
Strap aging.
Storage condition.
Previous user habits.
Possible modifications.
Using a product with unknown condition may increase accident risk.
Incorrect sizing may also affect body sensation and balance.
For safety and support reasons, official purchase routes are recommended.
13. Overseas Sales and Shipping
Q. Do you ship internationally?
Yes.
ippon blade is available internationally through the official overseas online shop.
Pricing, shipping fees, packaging, and support may differ between domestic and overseas sales.
International shipping requires additional packaging, logistics handling, communication, and support compared to domestic orders.
Q. Are import duties or taxes required?
Depending on the destination country, customs duties, import taxes, VAT, or brokerage fees may apply.
These are not included in the product price or shipping fee and must be paid by the customer upon delivery when required.
Import fees are determined by each country’s regulations, so exact amounts cannot be guaranteed in advance.
International customers should understand that customs-related charges may occur.
Q. Why is international shipping expensive?
International shipping involves significantly more cost than domestic shipping.
This includes:
international shipping fees
protective packaging materials
damage prevention measures
customs procedures
tracking management
international customer support
ippon blade is made of wood and has a unique shape compared to ordinary products.
Safe delivery requires careful packaging and handling.
For that reason, international shipping costs may be relatively high.
Q. How long does overseas delivery take?
Delivery time depends on destination and customs conditions, but generally takes approximately one to three weeks after shipment.
However, customs clearance, local carrier conditions, weather, and regional circumstances may cause delays.
Tracking information is provided after shipment.
Once the package arrives in the destination country, local carriers may handle final delivery.
If a delivery notice is left, follow the instructions of the local carrier.
Q. Is support available for overseas users?
Yes.
Support is provided for overseas users as much as possible.
This includes English guidance, instructional videos, safety information, sizing consultation, and shipping communication.
However, time differences, language barriers, and customs systems may occasionally slow response times.
Instruction pages and videos are continuously improved to help overseas users begin safely.
Q. Are there instruction videos?
Yes.
Videos are available explaining:
how to wear ippon blade
strap adjustment
beginner practice
safety guidelines
basic usage
English instruction pages are also available for overseas users.
Before use, customers are encouraged to review the guidance materials and videos carefully.
Do not begin by walking or running immediately.
Start by standing safely in a controlled environment.
Q. Is English support available?
Yes.
English support is available for product explanations, precautions, shipping guidance, and basic instruction.
For more detailed body-related concepts and subtle movement explanations, communication may require additional clarification.
ippon blade is also a project intended to share Japanese body culture internationally.
14. Instructor System
Q. Can I become an instructor?
Yes.
ippon blade has a structured learning system for people who want to teach.
However, not everyone can immediately begin instructing.
Because ippon blade directly affects the body, instructors must understand:
safety management
movement principles
body structure
teaching responsibility
the philosophy behind the practice
The instructor path is designed as a gradual learning process.
Q. What is the certification system?
The certification system is not simply about giving titles.
It exists to help people share ippon blade safely and responsibly.
The curriculum includes:
core philosophy
safety management
model characteristics
how to wear and use the product
standing and walking basics
body structure
instruction precautions
prohibited activities
brand guidelines
The system exists to support responsible expansion of ippon blade.
Q. What is a certified instructor?
Certified instructors are qualified to teach basic ippon blade usage and body awareness.
They may integrate ippon blade into their existing professional fields, such as:
yoga
Pilates
bodywork
acupuncture
personal training
running instruction
martial arts
dance
walking instruction
However, permissions regarding product sales and official activities differ depending on certification level.
Q. What is the difference between a certified instructor and an official instructor?
Official instructors carry deeper responsibility within the ippon blade system.
In addition to teaching, they may officially participate in sales, workshops, regional activities, events, support, and brand representation.
Certified instructors primarily focus on teaching.
Official instructors are expected to take greater responsibility as part of the brand itself.
Q. What is an organizer?
An organizer helps create local opportunities for ippon blade experiences and practice gatherings.
However, organizers are not teaching-certified instructors.
They may not independently conduct paid instruction or product sales.
Instead, organizers help connect communities with official instructors and certified teachers.
They serve as a bridge between local communities and the ippon blade culture.
Q. What kinds of people are involved?
People from many different backgrounds are involved with ippon blade, including:
runners
trainers
yoga instructors
Pilates instructors
bodyworkers
acupuncturists
physical therapy professionals
martial artists
dancers
sports coaches
educators
community organizers
nature guides
ippon blade is not limited to a single sport or field.
It focuses on revisiting the foundations of human movement.
Q. Can instructors work internationally?
International development and instructor training are planned for the future.
However, overseas activity requires careful consideration of:
safety communication
language
cultural differences
legal responsibility
sales management
trademark management
Anyone wishing to operate internationally should first consult officially.
Unauthorized instruction, sales, commercial activity, or use of the name is not permitted.
15. TENARI and the Philosophy Behind ippon blade
Q. What is TENARI?
TENARI is the base organization behind the development and expansion of ippon blade.
Based in Haruno Town, Hamamatsu City, Shizuoka, Japan, TENARI supports product development, instruction, certification programs, experiences, community activities, and nature-based practice.
The name TENARI reflects a connection between craftsmanship, the body, nature, and people.
ippon blade is one of TENARI’s central projects.
Q. Why is TENARI based in Haruno?
Haruno is a place where mountains, rivers, local traditions, spirituality, and nature still remain deeply connected to daily life.
ippon blade is not intended only as an urban fitness concept.
It is meant to reconnect the body with nature, local culture, and lived experience.
The environment of Haruno strongly aligns with the philosophy of ippon blade.
Feeling the ground.
Reorganizing the body through nature.
Growing culture together with a region.
For these reasons, Haruno became an important home for TENARI.
Q. Why is the area connected to “Tengu culture”?
The Haruno and Enshu regions preserve folklore and mountain traditions associated with Tengu.
In Japanese culture, Tengu symbolize mountains, physical mastery, discipline, nature, and extraordinary movement ability.
ippon blade reinterprets the symbolic image of the one-tooth sandal associated with Tengu into a modern body practice.
The phrase “Tengu village” is not simply a tourism slogan.
It reflects the overlap between regional culture, mountain traditions, body awareness, and the worldview behind ippon blade.
Q. Why is it more than just sport?
ippon blade can absolutely be enjoyed as sport.
It can be used for running, walking, performance, and training.
But beneath that is a deeper purpose.
That purpose is returning to oneself through the body.
Not only competition or records, but:
standing
walking
feeling
adjusting
connecting
These fundamental human sensations are central.
That is why ippon blade is both sport and something beyond sport.
Q. Why does the philosophy sound deeper than ordinary fitness?
Because the way we use the body is connected to the way we live.
Do we force everything through effort?
Or move with flow?
Do we control?
Or harmonize?
Do we rush?
Or listen?
When standing on ippon blade, people sometimes notice not only physical habits, but also patterns in thought and emotion.
That naturally makes the conversation philosophical.
However, the goal is not to impose difficult ideas.
The language exists simply to help people return to essentials through the body.
Q. Why is balance so important?
Balance is the center of ippon blade.
Balance of the body.
Balance of the mind.
Balance with gravity.
Balance with nature.
Balance with community.
Balance with culture.
When the goal becomes only power or winning, the body often breaks down.
Balance does not mean weakness.
It means reducing unnecessary force so natural strength can emerge.
Within ippon blade, balance is considered the deepest form of strength.
Q. Why share Japanese body culture internationally?
The one-tooth sandal is part of a uniquely Japanese body culture.
However, ippon blade is not about preserving nostalgia.
It is about sharing ways of sensing the body, nature, and axis that developed within Japanese culture, and translating them into a form relevant to the modern world.
Simply preserving tradition is not enough for it to survive.
Simply changing everything loses depth.
What matters is evolving while keeping the roots alive.
Q. What is the ultimate purpose of ippon blade?
The ultimate purpose of ippon blade is returning to essence through the body.
It is not only about becoming healthier.
Not only about running faster.
Not only about wearing something unusual.
It is about rediscovering the human capacity for sensation, axis, harmony, and connection with nature.
And then bringing that awareness into sport, daily life, community, culture, and the world.
That is the purpose of ippon blade.
Q. Why “return to essence”?
Modern life has become increasingly complicated.
More information.
More methods.
More “correct answers.”
More time spent in the head instead of the body.
But the human body itself is simple.
Standing.
Feeling.
Breathing.
The center of gravity moving.
Force returning from the ground.
The body moving naturally.
ippon blade exists to help people return to that simplicity.
16. Misunderstandings
Q. Is ippon blade a religion?
No.
ippon blade is not a religious activity.
It does not promote belief systems or require membership in any organization.
Words like Tengu, Zen, harmony, and mountain traditions may appear in the philosophy, but they are used in cultural, physical, and symbolic contexts.
The core of ippon blade is physical practice.
Q. Is it spiritual?
Some people may experience it that way.
However, ippon blade fundamentally works with center of gravity, foot sensation, ground reaction force, axis, and balance.
As people deepen body awareness, they may also notice changes in mental or emotional state.
Because body and mind are connected, deeper sensations may naturally emerge.
However, ippon blade does not claim supernatural or unscientific effects.
Q. Is it anti-science?
No.
ippon blade values concepts such as body structure, center of gravity, ground reaction force, postural control, and dynamic equilibrium.
At the same time, not everything about the body can be completely explained only through numbers or research papers.
Experience, sensation, environment, and individuality all matter.
ippon blade values both scientific perspectives and direct embodied practice.
Q. Is it just using Japanese culture for marketing?
No.
ippon blade respects the cultural background connected to one-tooth sandals, mountain traditions, body awareness, and Japanese views of nature.
At the same time, it reconstructs those ideas into a form relevant to the modern world.
The goal is not decorative tradition, but living culture experienced through the body.
Q. Why does it receive both positive and negative reactions?
Because it looks very different from ordinary shoes or conventional training methods.
For people seeing it for the first time, it may appear dangerous, strange, or unrealistic.
It can also be difficult to understand immediately through existing fitness or rehabilitation frameworks alone.
ippon blade is easy to judge based on appearance.
That is why actual experience and understanding of its structure and purpose matter.
Q. Why do negative comments happen?
In many cases, they come from first impressions and assumptions.
Seeing people walking or running on one tooth may initially look dangerous or irrational.
However, observing from the outside without experiencing it does not reveal what is happening internally within the body.
Safety concerns themselves are valid.
That is why ippon blade places strong emphasis on safety instruction, gradual progression, and guided practice.
Q. Why is it easily misunderstood?
Because the visual impact is strong.
A single-tooth structure looks radically different from ordinary footwear.
People tend to focus first on the unusual appearance or instability.
But the essence of ippon blade is not visual appearance.
It is about rediscovering:
foot sensation
center of gravity
axis
ground reaction force
whole-body connection
The contrast between the visual appearance and the deeper purpose often creates misunderstanding.
17. Concerns Before Purchasing
Q. I’m not sure if I can do it.
You do not need to be good at it immediately.
ippon blade is not only for naturally skilled people.
It is for developing body awareness gradually.
What matters is beginning carefully and without force.
At first, simply standing or stepping in place is enough.
Start by feeling the soles of the feet and the center of gravity in a safe environment.
Q. I’m afraid of falling.
That fear is natural.
In fact, fear itself often helps the body respond carefully.
However, there is no need to force yourself to walk or run while afraid.
At first, simply stand near a wall or railing in a safe space.
If fear feels strong, beginning with 1000 ZEN or taking a guided lesson with a certified instructor is recommended.
Q. I’m not athletic.
ippon blade is not determined only by athletic talent.
What matters is not powerful movement, but careful sensation.
In some cases, highly athletic people rely too much on force and muscle habits.
If you can move slowly, quietly, and pay attention to your body, you can begin.
Q. It’s expensive, so I feel uncertain.
That feeling is natural.
ippon blade is not intended as a casual impulse purchase.
Before buying, it is important to understand:
your goals
your physical condition
where you will use it
which model fits you
your size
safety considerations
available support
If possible, trying a lesson or experience session before purchasing is often a good option.
Q. I don’t know which model to choose.
For most beginners, 1000 ZEN is usually recommended.
It is lower, calmer, and easier to begin safely with.
For people interested in running or more advanced body sensation, 369 MIROKU may also be suitable.
If unsure, consult with your foot size, athletic background, goals, and intended environment.
Q. I’m worried I won’t continue using it.
There is no need for long daily sessions.
Short, careful practice is enough.
Even a few minutes of standing per day can be meaningful.
ippon blade is not about forcing discipline through willpower.
Ideally, practice continues naturally because it feels interesting, enjoyable, or physically meaningful.
18. Community
Q. Is there a community?
Yes.
ippon blade has a community connecting users, instructors, and practitioners.
Members share practice experiences, training ideas, event information, achievements, and safety-related knowledge.
The community also plays an important role in supporting verified users and maintaining safe practice standards.
Q. Are there events?
Yes.
ippon blade hosts experience sessions, practice gatherings, workshops, tours, and running-related events.
The content varies depending on the season and location.
At TENARI in Haruno, some events combine body practice with local culture and nature experiences.
Q. Are there marathon events?
There are plans for running events and marathon experiences based on the philosophy of ippon blade.
Rather than focusing only on speed and competition, the goal is to create events that value body awareness, nature, local culture, and harmony.
ippon blade running is not only about records.
It is also about sensing the relationship between the body and the earth itself.
Q. Are there practice sessions?
Yes.
Practice sessions may be held by instructors or regional groups.
These sessions often include:
basic standing
walking
safe usage
model differences
body awareness fundamentals
For beginners, joining a practice session is often safer and more effective than trying to learn entirely alone.
Q. Is there an international community?
Yes, slowly.
ippon blade users are beginning to grow internationally.
The project plans to continue expanding international support, information sharing, and community connections through English guides, videos, and support systems.
19. Maintenance
Q. Can the sole be replaced?
Yes.
The rubber sole naturally wears down with use.
Using worn soles may increase slipping risk and reduce safety.
Please inspect the sole regularly and replace it when necessary.
Guides and videos explaining replacement methods are available.
Q. Can it be repaired?
In some cases, yes.
However, severe wood damage, damaged teeth, modified products, or heavily deteriorated items may not be repairable.
If damage or instability is noticed, stop using the product and contact official support.
Self-repair or unauthorized modification may compromise safety.
Q. Can the straps be replaced?
Yes.
The straps are an important connection point between the body and the platform.
If you notice wear, loosening, discomfort, or damage, inspect them as early as possible.
Using damaged straps increases fall risk.
Q. How should it be stored?
Avoid direct sunlight, excessive heat, humidity, and water exposure.
Because ippon blade is made from natural wood, it is affected by moisture and drying conditions.
After use, lightly wipe away dirt or moisture and store it in a well-ventilated place.
Do not leave it for long periods inside hot vehicles or similar environments.
Q. What if it gets wet?
If it becomes wet, wipe off moisture with a dry cloth and allow it to air dry naturally in a ventilated area.
Avoid rapid drying with direct sunlight, heaters, or hair dryers.
Using it while wet increases slipping risk and may damage the wood or sole.
Q. How long does it last?
Lifespan depends on:
frequency of use
body weight
environment
maintenance condition
The sole and straps are consumable parts.
The wood also changes over time with use.
Regular inspection is important.
If you notice wear, cracking, looseness, unusual sounds, or strap deterioration, stop using it until checked.
Safe use depends on regular maintenance and early inspection.
Part 4 — Deeper Philosophy, Beginning the Journey, and Final Message
20. Deeper Philosophy
Q. Why “flow” instead of “force”?
Movement can be created through force.
But relying only on force often causes the body to harden.
A rigid body becomes less adaptable.
ippon blade values movement where the center of gravity shifts, the body receives ground reaction force, and the entire body moves together in flow.
Flow does not mean weakness.
It means reducing unnecessary tension so natural power can pass through the body more efficiently.
Q. Why did traditional Japanese body culture emphasize axis?
Many traditional Japanese body practices emphasize the concept of axis.
Martial arts.
Dance.
Tea ceremony.
Meditation.
Movement patterns.
Ways of walking.
These traditions often focus not only on muscular force, but on organizing the center, releasing unnecessary tension, and harmonizing with space.
ippon blade reconstructs this axis-based body culture into a modern physical practice.
At the same time, axis is not exclusive to Japanese people.
It is something universal within the human body.
Q. Why have modern people lost balance?
Modern life has reduced opportunities for the body to adapt naturally.
Flat floors.
Highly cushioned shoes.
Chair-centered lifestyles.
Cars and escalators.
Smartphones.
Long periods of sitting.
These things created convenience.
But they also reduced opportunities to feel the ground and continuously organize balance through the whole body.
ippon blade exists to help restore those diminished sensations.
Q. Why can the whole body change through the feet?
The feet are where the body connects with the ground.
When the feet change, the center of gravity changes.
When the center shifts, the knees, hips, pelvis, spine, shoulders, neck, and head also change.
The feet are both a foundation and a sensory organ.
ippon blade helps restore the connection from the feet to the entire body.
Q. Why can’t body and mind be completely separated?
Physical state affects mental state.
When tense, breathing becomes shallow.
When anxious, the feet become unstable.
When rushed, movement becomes rough.
When calm, the body softens.
The reverse is also true.
When the body becomes organized, the mind often becomes calmer.
Through ippon blade, people notice their condition through physical sensation.
That is why body and mind cannot be completely separated.
Q. Why does ippon blade go beyond sport?
ippon blade can absolutely be enjoyed as sport.
But competition and records are not the only purpose.
Standing.
Walking.
Running.
Feeling.
Adjusting.
Connecting with nature.
All of these are included.
Sport is one expression.
Beyond that is returning to essence through the body.
Q. Why the phrase “surfing the Earth”?
Standing on ippon blade can feel like balancing on a single point atop the Earth itself.
Through that single contact point, the ground, gravity, the body, and surrounding space become connected.
Rather than controlling the Earth, the feeling is one of balancing together with it.
That sensation is what the phrase “surfing the Earth” expresses.
Q. Why “Move with gravity”?
“Move with gravity” means exactly that.
The movement of ippon blade is not about overpowering gravity.
It is about sensing gravity, receiving ground reaction force, and moving through center-of-gravity shift.
No kicking.
No forcing.
No domination through power.
Move with gravity.
That is the meaning behind the phrase.
Q. What is “axis”?
Axis is the pathway running through the center of the body.
It connects the feet to the head, while also creating a sensation linking earth and sky.
Through the single support point of ippon blade, the body begins organizing around a central line.
That line is not merely posture.
It is a pathway back to one’s center.
Q. What does it mean to connect earth and sky?
Human beings stand on the ground while extending upward into space.
The feet connect downward.
The head opens upward.
Between them exists the body.
The axis felt through ippon blade becomes a sensation connecting ground, body, and surrounding space together.
As that axis strengthens, front and back, left and right, inside and outside begin to feel connected through one center.
Even when forms and expressions differ, the deeper essence often points toward the same place.
ippon blade is one way of rediscovering that physically.
Q. Why is the center so important?
Without a center, the body becomes fragmented.
Only the legs move.
Only the shoulders work.
Only the lower back supports everything.
This creates unnecessary tension and separation.
With a center, the body acts as one connected system.
Forward movement, lateral movement, upward extension, and inward awareness all organize more naturally around a center.
ippon blade helps people rediscover that center through the feet.
Q. Why can different forms still share the same essence?
Bodies, cultures, sports, and expressions all appear different externally.
A runner.
A dancer.
Someone praying.
Someone training.
Someone playing.
Outwardly, they may seem unrelated.
But deeply observed, many are attempts to return toward balance and center.
ippon blade is one doorway into physically sensing that shared essence.
Beyond differences in form, there is connection through center.
That too is part of the purpose of ippon blade.
21. Getting Started & Before Purchase
Q. What is the most important thing before starting ippon blade?
The most important thing is not forcing yourself.
ippon blade is not something controlled through force.
It is not about rushing to improve.
First, simply stand.
Feel the soles of your feet.
Feel your center of gravity.
Feel your breathing.
Observe how your body responds.
Start there.
ippon blade is not a test of ability.
It is a way of reconnecting with your own body.
Q. Can I try it before purchasing?
Yes.
Trial sessions and lessons are available through TENARI and certified instructors.
For first-time users, actually standing on ippon blade often communicates more than photos or text ever can.
If you are unsure about model selection, concerned about falling, or want guidance before starting, trying it first is recommended.
Q. Where can I buy ippon blade?
ippon blade is available through the official online shop and certified instructors.
For safety, sizing, instruction, and support reasons, purchasing through official channels is strongly recommended.
Resold items, used items, or imitation products may not qualify for support or safety verification.
Q. What should I do if I’m unsure?
If you are unsure, do not rush.
Please contact us.
By sharing your goals, foot size, movement experience, intended environment, and concerns, we can help guide you toward the most appropriate starting point.
ippon blade is not something created simply to sell.
It is meant to be introduced in a way that matches the individual person and their body.
Q. Who is ippon blade for?
For people who want to reconnect with their body.
People who have pushed too hard through force.
People who want to change how they move.
People who want to rethink walking or running.
People interested in Japanese body culture.
People seeking deeper athletic performance.
People wanting to move in greater harmony with nature.
People wanting to rediscover their center.
ippon blade exists for those people.
Q. Finally, what is ippon blade?
ippon blade is a way of remembering the body’s center through a single point of support.
It is not simply about standing on something unusual.
You feel the ground through the feet.
The center of gravity moves.
An axis forms.
Breathing changes.
The body reconnects.
You return to yourself.
ippon blade is not for dominating the body through force.
It is for harmonizing with gravity and rediscovering the body’s natural intelligence.
It is sport.
It is body culture.
It is a new physical doorway born from Japan.
Final Message
ippon blade is not magic.
Nothing instantly changes just by wearing it.
But the moment you stand on a single tooth, the body is unquestionably asked something.
Where am I standing right now?
Where is unnecessary tension held?
Where am I resisting?
Where is my center of gravity?
Where am I trying to go?
And the body begins answering those questions physically.
That is ippon blade.
Not toward force, but toward flow.
Not toward domination, but toward balance.
Not toward external correctness, but toward inner sensation.
From one tooth, a single point beneath the feet appears.
From that point, the body’s central axis rises.
That axis connects earth and sky, front and back, left and right, inside and outside.
Forms may differ.
Expressions may differ.
But when followed deeply enough, essence often points toward the same place.
ippon blade is not meant only to be intellectually understood.
It is an entrance for remembering through the body itself.
From a single axis, the body begins connecting once again.
— Ten Kodaira
Founder & Creator of ippon blade
TENARI Co., Ltd.