I remember Tiger saying one time that when he wants more power he snaps his left knee back.
It seems like a lot of the guys who hit it long have a straight left leg through impact. So what's up with that? Kenetic Chain Reaction or something???
Lag is an out-of-line trailing condition . . . lagging components are seeking to be in-line . . . maximum radius is obtained by swinging from the FEET . . . NOT the knees.