I hit pretty heavy topspin and use a full western forehand grip. I hit some of the spin with my wrist, and some of it with my elbow. I use Spiky Shark strings. But, I've noticed that a lot of Nadal's topspin comes from just moving his left arm up really fast and exaggerated. Does he not use as much wrist to generate the massive amount of spin he does? Or do I just not see hit wrist movement because he moves it so fast?