I feel your pain. I'm still waiting for my orthopedic or physical therapist to give me the ok for me to continue to run due to a dislocated kneecap. I lost a good 20 pounds last year, got down to human size, running most days and loved, LOVED the highs I'd get from pushing myself. I maintain my weight (still got 16 pounds to get to my goal) through good diet and exercise at a gym, but the gym doesn't compare.