Curious if doing one-legged squats are okay for your knees, etc. For those who don't know what they are here's a description. 1) stand on one leg. 2) raise other leg so that it is perpendicular to the standing leg and about waist high. 3) lower yourself all the way down. Keep foot flat on the ground and arms in front of you to help balance. Pause. 4) raise yourself back up. Repeat. Seems like a good exercise that works a full range of motion. Plus you can do it anywhere there is flat ground and works the stabilizing muscles.