The arms are just the arms. You can do some push ups, rotate them around the air, make them strong and loose, thats enough. The arms are just the arms, thats all. There is
one part of the body which the entire body is moved by; the hips. You can move your spine around your hips, you can move your legs around your hips, you can move your arms by moving your hips. Oh
those wonderful hips. How simple and great to wrestle, strike, or just dance all by moving the hips. I've found that, even after many years, I still have progress to make in the mobility of my hips. Why?
Because the whole body relates to those joints, my back must become stronger, my legs must become stronger, as well as more flexible, if I want to get more use out of my hips. Speed? Powerful hips are a sprinters secret. Power?
Powerful hips unite the whole body strength. I often hear talk of "following the principle" in martial arts, which often remain abstract after many years. Practitioners become proficient in the form but remain average in application. Why is that? Look at your body, your are essentially a pair of hips with arms attached, the hips being the engine behind the whole bodies movement, the arms being, well, just attached. So why do think your going to have remarkable movement skill without having remarkably capable hips? So yes do your stances and forms , but also realize, that bobbing and weaving, leaping and lunging, touching your toes or doing a back bend, are all functions of the hips. Lately in my solo practice, I have removed the arms movement entirely so that I can focus on the hips. Without your arms you are still a powerful animal, capable of controlling your body weight with the agility your hips can manifest. With your arms but without hips, your are little more than a scarecrow that can exert some limited force.