Single Leg Thigh Dip (Leg behind)

Be careful doing this thigh exercise. If it's not done properly you can damage your knees. It's easy to do it safely though...

See how Tom's knee is vertically above his foot. That's good technique. You just need to make sure your knee doesn't go past your foot.

1. Place the exercise ball against the wall at lower back level
2. Place one leg out in front and one behind
3. Lower your body down by bending your front leg
4. Raise up again by using your thigh muscles
5. Repeat x10 on each leg