Originally Posted by jmnk
So,which is it? Is one overpronating more than the other?
Watch Jeff's video again. On the follow thru, his racket ends up facing away from his body and then he pulls it down toward his body. Ultimately the pronation motion seems to be the same with both drills. After the racket pronates the face then falls or is pulled back down toward his body.
I've noticed this same motion on the big kick serves of Roddick. Perhaps Jeff can explain this, but I think it is probably just a result of the high elbow and natural relaxation of the lower arm.