WoW-addicted Mirweis sent me this WoW Fitness Program!:

Let's face it, if you're the typical WoW addict, you don't spend much time outside or away from your computer desk. (...) For each exercise below, I've given a basic starting point for how many times you should do each exercise. Remember, you have plenty of opportunities to squeeze these in over the course of a several hour WoW playing session... without having to leave your seat!

The website goes on with the description of movements using WoW gifs: