Fundamentals of Kicking (Chu Shong Tin Training Episodes #007)

It appears strange, even awkward, that the "crux" of the hip-joint-controlled kicking is the going-in of the thigh bone into the hip area. In a way, the going-in observation serves as an indicator of deep relaxation of hip muscles in that area. Without this happening, kicking still involves "flexing" the leg, the way of ordinary kicking; "flexing" refers to pulling forces inflicted by thick hip muscles. Such kicking is not initiated by rotating in joints. Although at the back the muscles are "dropped", in the front the muscles are still dominating (in contraction mode) – rotating in joints is just half-way ready.
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