Makes for great, or tedious, conversations
Makes for terrible teaching if overused.
Certainly is best left to the sciences
Biomechanics, kinesiology
And the scientists who can study the citations
For interpretations.

Full body motions such as hitting are driven primarily by the capabilities of the various ssytems to transmit information through the neuromuscular pathways. Muscles never, ever work independently and often involve (even in the slightest movements) the musculature at distant parts from the joint(s) being leveraged.