Originally Posted by
KPM
I disagree. My foundation is from a lineage that teaches to pivot on the heels. I practiced that way for many years until guys like Robert Chu and Zopa Gyatso on forums like this convinced me to try it otherwise. When I tried it I didn't get the results or acknowledge the difference right away. I had to keep practicing until I was good at the different method before I could admit that they were right. The upper body absolutely is not compromised when not pivoting on the heels....as long as you are doing it correctly. I also found my structure was much more solid by avoiding pivoting on my heels. Its comes down to simple biomechanics. If your weight is already on your heels when you are pivoting, then you have very little "reserve" to support your structure if pressed during the pivot. Any kind of "push off" against the opponent to apply "forward pressure" has to come almost exclusively from the hips and thighs, because being on the heels takes the calf muscles out of the equation. Again....lineage considerations aside and looking strictly from a biomechanical standpoint.....pivoting near the K1 point with close to 50/50 weight distribution engages the calf muscles for forward pressure and provides a "springy" reserve, almost like a shock absorber. The upper body absolutely does not get compromised, but is actually even more solid and functional. Been there...done that. But it took time and practice to do it well enough to see the benefits. But from a biomechanical standpoint, you can't argue against the fact that having the weight on the heels doesn't allow good use of the calf muscles or use of the the elasticity of the calf and arch of the foot. That is not to say that pivoting on the heels doesn't work. Obviously guys like WSL made it work very well! But it is not optimal from a anatomical viewpoint. And I know anatomy.
I've always been curious as to how the heel-shift developed. A lot of my Moy Yat 'family' members shift on the heel...but when I talk to those who trained directly under Moy Yat, they advocate shifting with the 'whole foot' or on K1, etc.
A good friend of mine who practices Red Boat Wing Chun was taught by his Sifu, simply, to just shift. As long as the hips were moving correctly, he let the rest come naturally. I wonder if that's perhaps how teachers like Ip Man did things...and then that's why we have such differences between families.
An ounce of action is worth a ton of theory. Friedrich Engels