Yoga. (Score 2)

I heartily recommend yoga (the kind where you stretch alot and stand on your head and stuff, not the pansy meditation and breathing stuff) for this
kind of problem. In addition to stretches and strength building it teaches body awareness which helps you keep good posture. I've also heard of
studies (sorry no references) that say that it can help people avoid problems with carpal tunnel syndrome; it certainly helps me. I go to one 1.5 hour class a week (Iyengar style) and it makes me
feel a whole lot better.