Being aware that my serve sucks really bad, I've set off on a mission to improve it. I've watched all youtube videos on this topic. I know all about the trophy position, loose arm, etc. Problem is, I can't seem to put it all in practice, at least not in a way that would work well. I am starting to think that there might be something physically wrong with my arm. After practicing a flat serve, my shoulder hurts. After practicing a kick serve, my elbow hurts. After either, I occasionally get wrist pain too. And I'm not talking hitting hundreds of serves either, the pain starts after only 10-15 serves. The funny thing is, the pain does not last long. Today I came home with my whole arm in pain, barely able to move it. Now one hour later, I feel fine.. Could it be that the nerve gets pinched somewhere in the shoulder/elbow joints? Any other ideas? And what can I do to avoid it??