As suggested I started a new thread. Here is the question I posed:
I'm curious what coaches on here think the purpose of this coil/uncoil in the rear hip is, regardless of how we describe the movement. Is it the primary power source? Is it a vital secondary power source? Is it just to aid in timing? Does it help transfer the energy more efficiently in the kinetic chain? Does it give the hips a running start? Or is it a combination of two or more of these?