A couple months ago, I finally finished my Bachelor's degree and suddenly had my evenings back after years of classes (was going the night school route). I decided to start taking Karate, something I did and enjoyed as a kid. I was a bit concerned that it would be too much for my hands with my history of RSI.
So far, it's going ok though. We usually do a few pushups during the warmup section of the class, but it's never enough to bother my hands. There was one day where we did punches on a heavy bag that I bowed out of, but other than that most of the kicks and punches are just done at the air, so they have not been a problem (other than the problem we all have of keeping our balance while standing on one leg and kicking). A couple weeks ago, I got my yellow belt. (I'm not sure which belt is the one where you start being dangerous to others rather than yourself :P) So far, so good.