4. Wall Squats
This is a more advanced move. You’ll keep your feet on the floor. Stand with your back against a wall, your feet about shoulder-width apart. Slowly bend your knees, and keep your back and pelvis against the wall. Hold for 5-10 seconds. Don’t bend too deeply. If you feel pressure or discomfort in your knees, change your position. Repeat the exercise, and try to hold the sit position a few seconds longer each time.