In an archived thread (Now You're Headed To Jail) Yoda wrote that the left shoulder has nothing to do with the hinge motions. Is that assertion perfectly true?
I can understand that it is true with respect to mechanical models where one has a "fixed" hinge pin location and one merely varies the pin orientation and thereby the blade motion. However, in a real-life golf swing the left shoulder socket is moving in space while the hinge motion is happening. Is there "evidence" that the arc of left shoulder movement and the "exact" point-location of the left shoulder socket in space at "every" moment during the followthrough is exactly the same for the three different hinging actions?
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