[Jeff]

O.B.

You wrote-: "as per another one of your threads, axis tilt as defined in TGM assumes the head is centered. The ability to do this is a display of "Hula hula flexibility" with the hips and a resulting tilt of shoulders."

I don't understand why axis tilt implies that the head be centered.

I prefer Yoda's advice given in post#16. The head position is dictated by the head position at impact. If one has a greater degree of secondary axis tilt at impact, then the head will need to be further back (away from the target). In Tiger's short iron swing, he doesn't have much secondary axis tilt at impact and his head position at impact would be centralised between his feet. However, when Tiger hits a driver he has a large amount of secondary axis tilt at impact, and that would cause his head to be behind the center of his stance. In that sense. Tiger Woods is following HK's advice by starting with his head at its impact location - which will be slightly behind the center of his stance when using a driver, and in the center of his stance when using a short iron. In both situations, that "head position" choice will allow the head to remain stationary.

Jeff.