Ramp up your stationary cardio. Get some good at home aerobics dvd's or something.
If that doesn't sound like your cup of tea, as a Marine myself aerobics just doesn't sound good enough, there are some really good hard core work out dvds out there so just keep an eye out for them.
Diagnosed UC 12/2007
Prednisone 40mg x 1/day
Mercaptopurine 50mg x1/day