APL76
Blue Belt
Thanks for sharing your personal clip. Mobility is a relative term and not an absolute term.
Let's look into YJKYM a bit deeper. Since you are standing square, you don't have the separation of
- leading leg, and
- back leg.
This means that if you want to move in, you have to move either the right leg, or the left leg. In both cases, the distance between you and your opponent will change.
Compare YJKYM with 4-6 stance (40% weight on front, 60% weight on back), the 4-6 stance has leading leg and back leg. When you move your
- leading leg, the distance between you and your opponent will change. This is the same as YJKYM.
- back leg, the distance between you and your opponent remain the same. This is a very important function. You can move your back leg forward to touch your leading leg. When you do that, since the distance between you and your opponent remains the same, your opponent may not notice it. You can then "spring" forward from there. All the jumping kicks are using the same footwork. The YJKYM just doesn't have this function.
Here is an example that you can use a "4-6 stance" to "hide your preparation for springing forward" by moving your back leg to touch your leading leg. If you can hide your preparation well, your sudden attack will be fast and surprised.
That footwork you are doing is found in Chum Kiu, Bui Jee and the Wooden Dummy forms, it has its place, however I personally wouldnāt use it in such an obvious and straight forwards manner as the person demonstrating it by kicking the tree, itās a good way to allow an opponent to get ahead of you.