I've been an avid weight lifter for quite a while...used to do body building comps actually...which is why I just got a road bike, because my back and knees are shot at 26! I'm just started physical therapy for my back and they have me doing pilates along with the PT. I have to say that I can throw weights around all day, but pilates (with minimal resistance) kicks my but after 20min. I plan on continuing with it after my PT. It gives you amazing strength an flexability. I use muscles I never knew I had! It's pretty amazing and quite a sense of acomplishment. I highly recommend it.

Kevin