Laura, thanks for the tips. As I suspected, I am going about the swing all wrong--directing the majority of power from my shoulder and a small amount from the wrist.
Gymgirl, no, now that I think about it, I haven't really been doing any kind of stretches or warm up before playing. Any advice on what I should be doing to warm up? I always stretch before n after lifting weight, but sports are a relatively new interest for me, so I never really think about stretching for anything besides
weight lifting.