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Hello warriors,
Power doesn’t come from the arm. It never did.
It comes from the ground, compressed through the body, released at the fist. The arm only delivers the message. The real engine sits much lower, down in the back leg, and most of us spend years never feeling it work.
I first learned to feel it on the floor of the Shirogane KWF Hombu Dōjō in Tokyo, under Yahara Sensei. It was his signature. And it was guarded. This deep compression work happened almost nowhere else in Japan. It lived inside his classes, and his classes were open only to black belts. The way his rear leg loaded and fired was something close to superhuman. And when you were on the receiving end of it? My friends, that is a thing you do not forget.
Over the years, that same compression slowly became mine too. I rarely teach it in this much detail, even on my own Dōjō floor. So treat this as an open door into a room that usually stays closed.
The follow-along video below is one hour. One principle. The compression of the back leg, carried from the warm-up all the way to Kata.
One compression, studied deeply
In Yūshin Geiko we work with several distinct ways of generating power with the body. When I recorded this class, I spoke of six. Today I teach seven.
The framework grew. Because a living practice is never finished, and I would rather show you my real path than pretend I arrived already complete. (That, by the way, is the whole point of this class. Hold the thought. We come back to it at the end.)
For now, forget the others. Today there is only one.
Back leg compression is simple to name and hard to own. The rear leg behaves like a spring. You load it, you store energy in the hip, the knee, the ankle, the tendon. Then you release everything at once and let that stored energy travel up through the body into the technique. The deeper and cleaner the load, the more explosive the release.
This is why a relaxed Karateka hits harder than a stiff one. Stiffness is a brake on the spring. Relaxation lets it fire.
The trap? Most of us never feel the loading phase at all. We rush straight to the punch. So in this class we do something almost stubborn. We slow down until the spring becomes impossible to ignore.
The class, chapter by chapter
0:00 — Introduction & opening Rei
1:27 — Taisō (warm-up)
14:36 — Basic punches (Choku Zuki, Oi Zuki)
20:58 — Basic kicks (Mae Geri, Yoko Geri Kekomi, Mawashi Geri)
25:40 — Compression Basic Kihon 1: Uke (the blocks)
33:12 — Compression Basic Kihon 2: Yori Ashi
37:56 — Compression Essentials 1: Building the body for compression, Gyaku Zuki
43:23 — Compression Essentials 2: Building the body for compression, Oi Zuki - Gyaku Zuki
48:25 — Be a “masterer”: the quest for feeling and the path to mastery
50:26 — Bassai Dai
54:55 — Final words & closing Rei
How the class is built
I designed this hour as a progression. Each step prepares the next.
The warm-up is already the lesson. We mobilise the joints, then we spend real time on the hips. One exercise matters more than the rest, and it came straight from Yahara Sensei, who had us do it before any Mawashi Geri practice.
You sit on the floor. One leg folds in front of you, the knee dropped to the side, the heel drawn toward the groin. The other leg folds behind you, its knee pointing out to the opposite side, the foot trailing behind your back. Now find the line. The two knees and the hips should fall into one straight line, the same axis your shoulders extend on either side. The rear hip stays loaded, tucked under you in a posterior pelvic tilt, exactly as it must be for a lateral kick.
From there you stretch laterally toward the knee of the rear leg, then turn the chest to face that same knee. It looks simple. It is not. If the hips sag or the line of the knees breaks, the whole purpose slips away. Placed correctly, this is the foundation of a true Hanmi in Zenkutsu Dachi, and the very hip feeling you need for Mawashi Geri and Yoko Geri Kekomi. Get the hips honest here, and the compression later has a home.
Basic Kihon comes next. Choku Zuki from Shizentai, weight projected slightly forward onto the toes, never sitting back on the heels. Slow at first, with one single image in mind: you are punching from the floor, and the energy rises through the body to the fist. Then we add speed and let it snap. We move into Oi Zuki, learning to project the body mass forward in one motion, the effort coming from the back leg, everything arriving together at the moment of impact.
Then the kicks. Mae Geri with a sharp snap and a strong supporting leg. Yoko Geri Kekomi, where you hit with the hip, not with the leg. Mawashi Geri, pulling the leg back with the hips after impact. Demanding work, all of it. And the rule never changes: the stiffer you are, the harder it gets.
Then we reach the heart of the class.
The secret is in two counts
Here is the method that changes everything.
We practise the blocks, Age Uke, Soto Uke, Uchi Uke, Gedan Barai, in two counts instead of one. On the first count, you load. You pull back the tendon, you feel the tension gather in the back hip, the knee, the ankle. On the second count, you release that load through a circular hip movement and let the technique fly.
Why cut the movement in half? Because it lets you feel the two components separately. Most people blur the load and the release into a single rush of effort, and never notice either one. Separate them, and suddenly you can sense the spring compressing, then firing. The more you take the technique apart this way, the easier it becomes to make it relaxed and fast when you put it back together.
A word of honesty here. These drills are exercises, not the destination. The real test comes later, in one count, in Kata, in Kumite. We take the movement apart so that one day the body can forget the pieces and simply move.
From there we carry the same compression into Yori Ashi, a Kumite-style shift. The back leg loads lightly while the weight stays in the center, ready to travel forward or back. Imagine an opponent arriving. You receive his power, then you counter. And never forget the Tanden, the centre that gives the technique its soul. Slow, then fast, then slow again. Fast and slow, over and over, raising the level little by little.
This is where the free road ends, and the real work begins.
🔒 The rest of this class is for Premium Members.
Below, we leave the basics behind and step into the Compression Essentials: the body-building drills for Gyaku Zuki and Oi Zuki that I almost never teach in this much detail, the Japan story behind the quest for feeling, and the Bassai Dai that ties the whole hour together.
Full access to our Japan-grade masterclasses and technical archives is reserved for our Premium Members.
