A-4:
I get a real good work out just playing the drums-especially for the cardiovascular system. When I'm home and not playing I'll work out on a stair master and with light weights with high repetitions. For our kind of muscles I find this to be the best, we don't want to be muscle bound. I also do a series of yoga stretches and postures, and I find that to be the best pre-show warm up and way to keep in shape on the road.
In terms of diet I find moderation is best for my system-I am not vegetarian, but I do usually use food combining techniques(especially on the road). This is eating starches w/vegetables, or proteins w/vegetables, or fruits alone, but never combining starches w/proteins or fruits w/anything. This aids with digestion and keeps me feeling light and more energetic. I never eat closer than 3 hours before I play.
I also take a lot of herbs and supplements for general health and to enhance my performance. I take ginseng for stamina and focus and the amino acids phenalalanine and tyrosine for mental alertness, but I would suggest you talk to a doctor or health specialist before trying anything I do because it might not be the best thing for your personal system.
And remember all of the above won't make you play the drums any better-only practicing and playing experience will do that-buy it could make you feel healthier so you can play more efficiently at whatever level of player you are!!