Stability Ball Leg Curl
- Lay on your back with both feet up on the stability ball and your arms out away from your body.
- Lift your hips up off the ground so that your body is in a straight line.
- Using your hamstrings, flex the knees to a 90 degree angle while keeping the rest of your body in a straight line.
- Return to start position.
- Once you bring your hips up to begin the set they stay off of the ground for the remainder of the set.