I've been looking at this for a while now. I don't see many if any tour players that can maintain a neutral spine on the downswing. Some start out with the spine very straight, but they don't look that way at impact(Tiger, Adam Scott).
I am wonderning if this is even good for the back... to try to set up with the REAR END STUCK OUT, THE BACK, RAM-ROD STRAIGHT , AND CHIN UP? I think the rear out produces what is called the LORDONIC CURVE, which some say is desirable.
I know Annikan has done some studying on this, and has supplied some very interesting pictures of what players actually do.
What is the ideal POSTURE for performance and health?