I am a student of golf biomechanics because I think that a golfer is likely to swing better if he moves in a biomechanically natural manner. That's why I constantly study the swings of good players to try and identify biomechanically sound golf movement practices that are consistent with sound TGM mechanical principles. HK did wonderful work on the mechanics/physics/geometry of the golf swing, but he didn't have much to say about how the body must move biomechanically to achieve desirable TGM practices.
I suspect that Tiger Woods' head falls back-and-down because he develops so much secondary axis tilt in his driver swing. He has far less secondary axis tilt in his mid/short iron swings.
I simply define a reverse pivot as a backswing action where the spine tilts left towards the target, so that the golfer is leaning over to the left at the end of the backswing. I think that a severe reverse pivoting golfer cannot hit a draw because he is forced to throw his club OTT to get his hands down to the ball. There is no space below the right shoulder as occurs when a golfer has the standard pivot-driven swing which allows one to establish a reverse-K look at the end-backswing position.
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