I agree, with that type of inflammation, you should really consider leaving the lower body alone alltogether for weights and cardio except for walking or something functional like that which does not irritate it. You can still do lots with your upper body, including this form of cardio: Hit the pool with a noodle or a kickboard, and set your feet either up on the noodle, or put the kickboard in between your legs, so that it floats your lower half, then swim with your upper half. Do butterfly strokes, freestyle, traditional swim strokes, and back strokes all the while resting your feet up on the noodle or holding the kickboard, so that your legs are just resting and not having to move. It will definately get your heart rate up!!!