I don’t keep my heel on the ground anymore

In fact, I don’t think about my heel at all.

But that doesn’t stop well-intentioned black belts from trying to correct me. Every time I go to a clinic or a retreat, sooner or later someone notices. They watch me throw a punch, see my rear heel lift, and gently pull me aside.

“You need to keep your heel down,” they say. “That’s where the power comes from.”

I always smile and nod. They’re not wrong in spirit. The ground does matter. But the explanation they’ve been given—and are now repeating—sounds scientific while actually having very little scientific truth behind it.

The phrase you’ll hear in almost every martial arts school is that “power comes from the ground.” And in a broad sense, that’s true. When you move, you push against the floor and the floor pushes back. Physicists call this ground reaction force. Biomechanics calls it the start of the kinetic chain: the sequence of movement that runs from the legs through the hips and torso and finally out through the arm.

But the important detail is when that force happens.

The push against the ground occurs earlier in the movement, when the body drives forward and begins accelerating. That’s the ignition. Once the body mass is moving and the hips are rotating, the energy is already traveling through the chain. By the time the punch actually lands, the body isn’t generating power from the floor anymore—it’s transferring momentum that was created a moment earlier.

Sports scientists study this using force plates embedded in the floor. These plates measure exactly when athletes produce force against the ground. Across many different sports, the pattern is consistent: peak ground reaction force happens during the drive phase of the movement, not at the moment of impact.

Which means something important for striking.

Whether your heel is touching the floor at the instant your fist lands is largely beside the point. The work has already been done.

If staying connected to the earth at the moment of power transfer were truly necessary, a lot of sports would suddenly stop working.

Take baseball pitching. A professional pitcher can throw a ball more than one hundred miles per hour. That ball leaves the hand with enormous speed and energy. But if you watch carefully, you’ll notice something interesting: at the moment the ball is released, the pitcher’s back foot is often completely off the ground.

Not just the heel.

The entire foot.

In other words, a human being can generate tremendous power, transfer it through the body, and launch a projectile at highway speeds while no longer being connected to the ground at that moment at all. The energy was created earlier when the pitcher drove off the mound. From there it moves through the hips, torso, shoulder, and arm like a whip.

Striking works the same way.

Once the body mass is moving forward and the hips are rotating, the punch is powered by momentum and rotational torque. That’s why if you watch high-level boxers or kickboxers, the rear heel almost always lifts during a hard punch. Sometimes the rear foot even slides forward slightly as the body moves through the strike. That slide isn’t a loss of power—it’s simply the body continuing to move forward after the force has already been generated.

And this brings us to another misconception that quietly fuels the whole heel-on-the-ground idea: the belief that a punch needs enormous power to be effective.

It doesn’t.

The human brain is surprisingly easy to disrupt. Knockouts rarely happen because the skull is crushed with overwhelming force. They happen because the head snaps and the brain accelerates suddenly inside the skull. A sharp change in motion—especially through the jaw—is what shuts the lights off.

If you’ve ever stood up quickly and hit your head on the corner of a cabinet, you already understand this principle. You didn’t swing at that cabinet like a heavyweight champion. You just stood up. And yet the moment your skull met the cupboard, you saw stars and briefly reconsidered all your life decisions.

The force involved in that moment was probably far less than what even an average punch can generate.

Or think about a bird flying into a window. A small sparrow weighing only a few ounces of feathers and questionable judgment hits the glass and knocks itself unconscious. The bird isn’t strong. It’s just moving quickly and then stopping suddenly. That sudden change in motion is enough to disrupt the brain.

Your head works the same way.

Once you understand that, the obsession with squeezing every last ounce of power out of the ground begins to look a little strange. It’s like trying to modify your car so it can drive three hundred miles per hour when the road you’re on only requires forty.

The real tradeoff is mobility.

Locking the heel into the floor creates a rigid base. It can make a technique look solid in a demonstration, but it also slows recovery and makes the body less adaptable. In a real exchange, the ability to move immediately after striking is far more valuable than extracting the last ten percent of theoretical power from the ground.

Fighting isn’t about throwing one perfect punch and freezing in place while everyone admires your stance. It’s about striking, adjusting, and moving again. Fluid movement supports that. Rigidity fights against it.

None of this means the ground isn’t important. It absolutely is. Every powerful movement begins by pushing against the floor. But once the body is moving, the energy has already been created. The kinetic chain is already in motion. The heel doesn’t need to stay glued to the earth like a power cord plugged into the planet.

A better question to ask when you punch isn’t “Is my heel touching the ground?”

It’s “Is my body moving efficiently?”

Are you driving from the floor? Are your hips rotating freely? Is the body transferring momentum smoothly through the strike?

If those things are happening, the heel will do whatever it naturally needs to do. Sometimes it will stay down. Sometimes it will lift. Sometimes the rear foot will slide forward slightly.

None of that is a mistake. It’s simply what happens when a human body moves quickly and efficiently.

Karate doesn’t lose anything by recognizing this. If anything, it gains something important. The moment we stop trying to freeze movement into rigid shapes and start allowing the body to move the way it naturally produces power, our strikes become faster, smoother, and easier to recover from.

Power still comes from the ground.

Good movement just doesn’t stay there.