Ok thanks.
And some good news, I took about a week off to rest my arm (I also went on a skiing trip) and I just played today. I took it easy but most of my serves felt good with my shoulder. I'll just continue slowly progressing and be aware.
All right here are some videos of me serving and now I know I foot fault a lot.
http://m.youtube.com/watch?feature=m-ch-fea&v=loIzdJnV66E
http://m.youtube.com/watch?v=ZPTbc16o0Z8
So I should try relaxing my motion. I don't think my technique is the problem, but I've been wanting to see what form looks like anyway. I don't think it's anything to serious, but I need to fix it.
The last few times I've played tennis my shoulder has had sharp pain when I serve. It's a sharp pain about where the shoulder and arm reach each other. This does not occur on any other of my shots, besides over head/serves. It also doesn't hurt if I serve with out a tennis ball. It hurts when I...