i'm just getting over a broken ankle-- i still have a lot of tenderness and can't really use a full range of motion, but i'm getting really sick of lifting upper body parts and doing ab work. i really want to get some cardio in, but i'm not sure what would be easiest on my ankle, but would still give me an efficient workout. to give you an idea of the progress, i can put enough weight on it that i can somewhat comfortably walk down steps, but i still limp slightly when i walk, and i'm still in an air cast. most of the pain is in the outer and backside of my ankle. any suggestions?