Thanks for the reply. Do you know which PGA tour golfers allow their pelvis to slide to the right during the backswing. It is my impression that most PGA tour golfers pivot-rotate around a slightly flexed right knee and don't allow the pelvis to slide to the right. Some, like Ben Hogan, even push their pelvis left-laterally in the late backswing, causing even more left-shift of the lumbar spine, as the following photo series demonstrates.
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