From Sensei Steve
Lott, Ueshiro Midtown Karate Dojo, NYC
Isolating the hip when punching - Dont move the shoulders
As described recently the hip is a major key in generating power. But it is important to be able to incorporate the hip properly when performing a technique so that the move is effective as well as looking clean. This involves using the most valuable tool in the dojo - our old friend the mirror.
The best way to practice this is walking punch. First start out with the mirror on your right side. Take the position of right foot-left hand reverse punch. Do not take yours eyes off the mirror.
The following occur in this order:
But the common error here is in #3. Unintentionally, we turn the shoulders when we load the hip. The shoulders must always remain still and parallel to the opponent. In order to practice this without turning the shoulders try the following:
Begin as above with #1 and #2
After you practice 1-4 from this angle - reverse it. Start out with the mirror on your left with left foot forward - right hand extended.
This same isolated hip motion occurs with walking chest block and walking head block.
Just remember to keep your eyes on the mirror and enjoy the show.