Start with Letter One Here <<==

The Path Beneath the Art

Warriors –

Every sincere search eventually arrives at a place where another technique is no longer the answer.

For a long time, that realization can feel unsettling.

The instinct is to continue searching outward—to attend another seminar, study another system, collect another method, or hope that somewhere, someone possesses the missing piece.

I understand that instinct because I have lived it.

For many years, I believed the next breakthrough would come from discovering something I did not yet know. What I did not understand was that the most important discoveries are rarely found by adding something new. More often, they emerge when everything we have learned begins to reveal the same underlying truth.

Looking back over nearly four decades of practice, I no longer see separate systems.

I no longer see Japanese martial arts over here and Chinese internal arts over there. I no longer separate standing practice from strength training, breathing from movement, or physical conditioning from martial skill.

I see one conversation unfolding through many different languages.

Every meaningful teacher I encountered was pointing toward the same destination.

Some emphasized posture.

Others emphasized breath.

Some cultivated stillness.

Others cultivated movement.

Some developed tendon strength.

Others developed internal pressure.

Their methods differed because their traditions differed.

Their principles did not.

Slowly, almost without realizing it, I stopped collecting methods.

I began searching for principles.

Methods belong to cultures.

Principles belong to reality.

Methods evolve.

Principles endure.

That realization changed not only the way I trained, but the way I understood martial arts themselves. I no longer believed that the purpose of training was simply to accumulate greater technical knowledge. Nor did I believe that the purpose was merely to become stronger, faster, or more physically capable.

Those qualities matter.

But they are not the destination.

They are the natural consequence of something deeper. The true work of martial practice is the lifelong cultivation of the practitioner. Everything else grows from that foundation.

When the practitioner becomes more powerful, technique changes.

When the practitioner becomes more connected, power changes.

When the practitioner becomes more resilient, endurance changes.

When the practitioner becomes more aware, timing changes.

When the practitioner becomes more fully integrated, the entire art changes.

Nothing has been added.

Everything has been transformed.

For many years I struggled to explain this to my students.

I taught standing practice.

I taught breathing.

I taught isometrics.

I taught Martial Qigong.

I taught Iron Silk.

I taught body conditioning.

I taught classical kata.

Each method revealed another piece of the puzzle.

Each helped students develop a particular quality.

Yet something continued to trouble me.

The pieces remained scattered.

Students learned methods.

What I truly wanted to teach was the path. Only much later did I realize that I had not spent decades creating separate courses. I had been describing different rooms within the same house.

The house itself had remained invisible.

As the years passed, the architecture gradually revealed itself. I could finally see the deeper order that had always been present.

Structure before strength.

Connection before power.

Presence before precision.

Cultivation before expression.

These were not isolated lessons.

They were enduring principles.

The methods simply gave those principles a place to live. At some point I needed a way to describe that path. Not because I believed I had invented something new.

Quite the opposite.

Because I finally recognized something that had been quietly present throughout my entire journey.

One phrase continued returning to me.

Again and again.

It became the compass by which I evaluated every exercise, every drill, every tradition, and every hour of practice.

Build the Body Beneath the Art.

Not because the body is more important than the art. But because every art is ultimately limited—or liberated—by the body that expresses it.

The body is not the destination.

It is the living foundation upon which the art is built.

If the foundation is weak, the art remains constrained.

If the foundation is patiently cultivated, the art continues to deepen for a lifetime.

That simple realization has become the guiding philosophy behind everything I teach.

It is why I no longer ask whether a method belongs to one style or another.

I ask whether it helps cultivate the practitioner.

Does it develop structure?

Does it deepen connection?

Does it foster resilience?

Does it encourage awareness?

Does it prepare the body to express the art more completely?

If the answer is yes, it belongs.

Everything else is simply a matter of language.

Over the years, many students asked me where they should begin.

Should they start with standing?

With breathing?

With isometrics?

With Martial Qigong?

With Iron Silk?

With strength training?

My answer gradually became clear. The question was never where to begin. The question was how all of these practices belonged together.

That realization eventually led me to organize everything I had learned into a single developmental path—not another collection of courses, but a coherent framework through which these principles could be practiced, embodied, and lived.

I call that framework the Iron Body Core System.

Not because it contains every answer.

No system ever could.

But because it represents the clearest expression I have yet found of the path I have been walking for nearly forty years.

If these letters have resonated with you, perhaps it is because you have been asking many of the same questions.

If so, I would be honored to continue that search together.

​The Iron Body Core System is simply my invitation to walk that path with me.

Not as followers.

Not as imitators.

But as fellow practitioners committed to the lifelong work of cultivation.

The masters never asked us to become copies of themselves. They invited us to seek what they sought. That invitation remains before us today.

May we have the patience to accept it.

May we have the discipline to continue it.

And may we never forget that the highest purpose of martial practice is not merely to master techniques.

It is to become the kind of human being capable of expressing them.

Stronger Every Day,

Jon Haas, The Warrior Coach

Read Letter 5 here <<==

Seek What They Sought

Warriors –

There are certain sentences that enter your life quietly. You read them once, appreciate their beauty, and move on.

Then, years later, after enough practice, enough mistakes, and enough honest reflection, you discover that those same words have been patiently waiting for you all along.

For me, this was one of those sentences.

For many years I believed my goal was to follow the great masters.

I studied their techniques.

I practiced their kata.

I admired their accomplishments.

I tried to understand how they moved.

But, eventually I realized that imitation was never the goal. The goal was understanding. Not understanding what they did. Understanding what they were searching for.

That realization changed the direction of my entire journey.

I stopped asking why Sagawa moved the way he moved.

I began asking what he had discovered.

I stopped asking why Wang Xiangzhai devoted so much of his practice to standing meditation.

I began asking what truth he believed standing could reveal.

I stopped asking why the old masters returned again and again to posture, breathing, structure, patience, and seemingly simple exercises.

I began asking why these same principles kept appearing across traditions that had never met one another.

Different countries.

Different languages.

Different histories.

Different methods.

Yet somehow they continued arriving at remarkably similar conclusions.

That cannot be an accident. It suggests that beneath every method lies something deeper. A principle waiting to be discovered.

The longer I trained, the less interested I became in collecting methods.

I wanted to understand the principles that gave birth to those methods.

Methods belong to styles.

Principles belong to reality.

Styles evolve.

Methods change.

Principles endure.

That realization liberated me.

I no longer felt compelled to choose between Japanese martial arts and Chinese internal arts. Between old-time strength training and modern exercise science. Between standing meditation and strength development.

If they revealed the same principle, they belonged together.

The principle was more important than the method.

Many years after this realization began taking shape, I encountered a statement from Yukiyoshi Sagawa that seemed to express in a few direct sentences what had taken me decades to understand.

When I first read those words, they sounded severe.

Today they sound compassionate.

Sagawa was not diminishing technique. He was reminding us that technique can never rise above the quality of the practitioner expressing it.

Technique is not where mastery begins. It is where mastery becomes visible.

Everything else happens long before anyone is watching.

That is why the greatest lessons are often hidden inside the simplest practices.

Standing quietly.

Breathing attentively.

Moving with awareness.

Returning every day.

These things rarely impress spectators.

Yet they transform practitioners.

Looking back over forty years of training, I no longer believe I have spent my life studying different martial arts.

I believe I have spent my life following a single question through many different traditions.

Each teacher offered a different path.

Each tradition spoke a different language.

Yet all of them pointed toward the same mountain.

Not the perfection of technique.

The cultivation of the human being. I suspect that is what the masters were really seeking. And I believe that search is still worthy of our lives today.

The longer I reflect on these things, the less interested I become in preserving methods simply because they are old, or adopting new methods simply because they are modern.

Age has very little to do with truth.

What matters is whether a method reveals an enduring principle.

The responsibility of every generation is not merely to preserve the forms it has inherited.

It is to rediscover the principles that gave those forms life in the first place.

That is why I no longer ask whether an exercise is Japanese or Chinese.

Ancient or modern.

Traditional or scientific.

I ask only one question.

What truth does it reveal about the cultivation of the practitioner? If that truth is genuine, then it deserves to be preserved. If it helps us become stronger without becoming rigid…

More resilient without becoming hardened…

More capable without becoming arrogant…

Then it belongs on the path.

Perhaps that is what Bashō was inviting us to understand all along.

The masters never asked us to become copies of themselves.

They invited us to continue the search.

Not to walk in their footsteps…

But to seek what they sought.

That search has become the work of my life.

Tomorrow, I’d like to share where that search ultimately led me—and why I believe every meaningful method I have ever studied is part of a single path that I now simply describe as building the body beneath the art.

Stronger Every Day!

Jon Haas, The Warrior Coach

Read Letter 4 here <<==

The Invisible Practice

Warriors –

Every martial artist practices two arts.

One can be seen.

The other cannot.

The visible art is familiar to all of us. It is found in punches and throws, in kata and footwork, in timing and distance, in locks, strikes, and countless hours spent refining movement. It is the art that instructors correct, that spectators admire, and that students devote years to mastering.

The invisible art is quieter.

It reveals itself only gradually, almost reluctantly, through years of sincere practice. It is the cultivation of qualities that cannot be photographed or measured, yet determine the character of every movement we make. It is the patient development of structure, balance, awareness, connection, resilience, presence, and integrity.

The longer I train, the more convinced I become that the visible art has always been shaped by the invisible one.

When we watch a great practitioner, we are naturally drawn to what we can see. We admire the effortless throw, the perfectly timed strike, the calm precision with which every movement unfolds. We assume that what we are witnessing is extraordinary technique.

Perhaps it is.

But perhaps we are witnessing something much deeper.

Perhaps we are seeing the visible expression of decades of invisible cultivation.

A magnificent tree does not stand because its branches have been carefully polished.

It stands because unseen roots have continued to deepen beneath the surface for many years. The strength of the tree is not determined by what is visible above the ground. It is determined by what has quietly developed below it.

Martial practice follows the same law.

Technique is the branch.

Cultivation is the root.

One cannot flourish for long without the other.

For much of my own journey, I devoted my attention to the branches. I believed that another technique, another principle, another kata, or another seminar would eventually reveal the understanding I was seeking.

Some of those experiences were invaluable.

Many simply expanded my collection of knowledge.

Only with time did I begin to recognize a humbling truth.

The techniques themselves had never been the destination.

They were invitations.

Every technique was quietly asking something of me long before it ever asked anything of an opponent.

A punch was asking whether my body could remain connected from the ground to the fist.

A throw was asking whether I could maintain balance while taking another person’s balance.

A lock was asking whether I could cultivate sensitivity before relying on force.

Even standing still was asking whether I possessed the patience to remain present when nothing appeared to be happening.

The techniques were never simply teaching me how to move.

They were asking me to become someone capable of moving in that way.

Looking back, I realize that every meaningful lesson in martial arts has carried this same invitation.

Not merely to acquire another skill.

But to undergo another transformation.

There is an important distinction between knowing a principle and embodying it.

Knowledge lives in the mind.

Embodiment lives in the whole person.

A principle that exists only as an idea remains fragile. Under pressure it is easily forgotten. But when that same principle has been patiently cultivated through thousands of quiet repetitions, it no longer requires conscious thought. It has become part of your nature.

This is why the greatest practitioners often appear so ordinary.

Their movements are rarely dramatic.

They do not force technique.

They do not display effort.

They simply express what they have become.

Technique is no longer something they perform.

It is something they embody.

For many years I divided my training into separate compartments. Strength belonged in one place. Standing practice belonged somewhere else. Breathing was something different. Mobility belonged to another discipline. Martial technique belonged inside the dojo.

Eventually I realized that these distinctions existed only in my own thinking.

The body recognizes no such divisions.

It simply expresses whatever it has become.

Seen in this light, every meaningful practice serves the same purpose.

Standing is not merely standing.

Breathing is not merely breathing.

Strength training is not merely strength training.

Each becomes another opportunity to cultivate the practitioner.

Each becomes another way of tending the roots rather than merely polishing the branches.

This realization transformed the way I evaluate every exercise, every drill, and every hour I spend training.

I no longer ask, “Will this make me stronger?”

Nor do I ask, “Will this improve my technique?”

I ask a different question.

Will this help me become the kind of practitioner my art is asking me to become?

I have come to believe that this is the invisible practice.

It is the work that receives little recognition because so much of it occurs beyond the reach of the eye. It cannot be measured by rank, trophies, demonstrations, or applause.

Yet it quietly determines everything the world will eventually see.

The visible art will always attract our attention.

The invisible art will always determine its depth.

Stronger Every Day,

Jon Haas, The Warrior Coach

P.S. In the next letter, I’d like to share a lesson from Yukiyoshi Sagawa that illuminated this truth in a profound way. More importantly, I’d like to explore why the greatest masters of every tradition were never simply preserving techniques—they were searching for principles that transcended style, culture, and even time itself.

​Read Letter 3 here <<==

The Beginning of a Different Question

Warriors –

Over the past four decades, I’ve had the privilege of studying with remarkable teachers, training alongside extraordinary martial artists, and spending thousands of hours on the mats, in the dojo, and in the gym.

I’ve devoted much of my life to understanding one simple question: Why do some martial artists continue getting stronger, more capable, and more powerful as they age… while others slowly decline despite years of dedicated practice?

It’s a question that has fascinated me for decades.

There comes a point in every martial artist’s life when technique is no longer enough.

The movements remain the same, yet the body begins to change. Recovery takes longer. Old injuries linger. Strength becomes less dependable. Techniques that once felt effortless begin to require conscious effort. Many practitioners respond by searching for another kata, another seminar, another drill, or another secret hidden somewhere just beyond their current understanding.

For many years, I did exactly the same thing.

I believed that every limitation in my martial art could be overcome by learning another technique.

If my strikes lacked power, I searched for a better striking method.

If my throws failed, I refined my mechanics.

If my timing was inconsistent, I assumed I simply needed more practice.

Like countless martial artists before me, I devoted myself to collecting knowledge. I studied classical kata. I trained under remarkable teachers. I filled notebooks with principles, observations, and training ideas. Every new lesson felt like another step toward mastery.

Some of those lessons transformed my understanding.

Many simply added to my collection.

It took me nearly four decades to recognize that I had been asking the wrong question.

The question was never, “What technique should I learn next?”

The deeper question was, “What kind of person must I become in order to express the art at its highest level?”

That question quietly changed everything.

As the years passed, I began noticing something that I could not easily explain.

I met practitioners whose technical knowledge seemed almost limitless. Their kata were beautiful. Their movements were precise. They could explain every principle in extraordinary detail. Yet when they moved, something felt incomplete. The techniques were correct, but they lacked a quality that cannot be measured by angles or mechanics alone.

Then I met others whose movements appeared almost ordinary.

They did not rely on speed.

They did not rely on muscular strength.

They did not overwhelm you with complexity.

Yet the moment you touched them, you encountered something entirely different…

They were rooted without becoming rigid.

Relaxed without becoming weak.

Powerful without appearing forceful.

There was a unity throughout their entire body that made every movement feel inevitable, like the force of gravity itself.

At first I believed I was witnessing superior technique.

Eventually I realized I was witnessing something much deeper.

I was witnessing the expression of a lifetime of cultivation.

That realization forced me to reconsider everything I thought I understood about martial arts. Perhaps the true purpose of training was never simply to accumulate techniques. Perhaps techniques were only the visible surface of something much deeper. Perhaps every kata, every drill, every exercise, and every hour spent on the training floor was pointing toward the same destination.

Not the perfection of movement.

The cultivation of the practitioner.

That simple distinction changed the direction of my life.

For years I believed I was studying martial arts.

Looking back, I now understand that martial arts were quietly studying me.

Every challenge demanded greater patience.

Every failure revealed another weakness.

Every success hinted at a deeper level still waiting to be discovered.

Without realizing it, I was not simply learning how to punch, throw, lock, or strike.

I was being shaped.

The older I become, the more convinced I am that this is the true purpose of martial practice.

Not merely to become technically proficient.

But to become the kind of human being capable of expressing those techniques with integrity, resilience, wisdom, and effortless power.

Everything else is simply a method.

Over the coming letters, I’d like to share the philosophy that gradually emerged from this lifelong search. It is not a philosophy I invented, nor one that belongs to any single style or tradition. Rather, it is a way of understanding martial development that I discovered repeated again and again throughout the Japanese arts, the Chinese internal traditions, old-time physical culture, and modern strength training.

Different methods.

Different cultures.

Different languages.

Yet all quietly pointing toward the same enduring truth.

I believe the highest purpose of martial training is not merely to perfect technique.

It is to cultivate the practitioner.

And once that changes, everything else begins to change as well.

Stronger Every Day,

Jon Haas, The Warrior Coach

P.S. In the next letter, I’d like to explore a realization that took me many years to fully understand: technique and the body are not separate pursuits. One is simply the visible expression of the other. Once I saw that clearly, I could never look at martial training the same way again.

Read Letter 2 here <<==