[djd]

as- mac's head appears to move slightly forward (toward the target) on the downswing (pic #5 ) and then maybe a bit backwards (pic 7 ), but perhaps this appearance is due to head rotation ... purtzer's head, however, certainly appears to move backwards on the downswing (pics 6&7 ) ... what is the particular significance (if any) to their head movements with respect to contributing to the efficiency of their individual swings. thanks.