Bao wrote:The gua, dan tian, spine, muscles of the back, scapula, shoulder. All the 8 wins use body mechanics in a very distinct manner. Some movements focus more on kai than on he, some more he than kai. Some use "rising energy", some others use "falling energy", some use contraction, some use expansion. Looking at the body mechanics, they are all opposites to each other in different ways.
That's an interesting perspective, that what distinguishes the 8 "jin" is what combination of body mechanics is used in each. I'm not sure that is true, but an interesting way to look at it.