genuine technical discussion... please take a few minutes to watch this thru. http://www.youtube.com/watch?v=-oZmH03cmMw imo the tennis serve is similar in so many ways, leg loads, torso loads, shoulder rotation, protation etc, as well as the firing sequence. so the pure 'swinging action' is out, due to the weight shift from the trophy to the finish. 'throwing' is quite often used as an analogy for the serve.... shift-turn-shift-turn action. my question is - is 'hitting' legit in serve? is the arm supposed to be completely passive? is it legit to thrust the arm, especially the forearm wrist extension-flexion action to add speed?