I was reading the thread, "springing with the ball?", and followed Marius's link to the thread, "jumping when hitting groundstrokes." It seemed like few people were willing to admit that tennis players jump on their groundstrokes. For example, alan-n wrote (and I'm not trying to pick on alan, many other people wrote the exact same thing) Funny thing. When I want to jump (say, in Basketball, a sport that, as far as I know, "allows" its players to jump) I bend down, then thrust up with my legs, and magically, I seem to come off the ground by 4-5 inches! Come on! Why can't we just call it jumping? Why does it have to be the mysterious result of some twisting or turning or coiling somewhere in the legs or hips?