Found on BodyBuilding.com
- Begin on the floor laying on your back with your feet on top of the ball.
- Position the ball so that when your legs are extended your ankles are on top of the ball. This will be your starting position.
- Raise your hips off of the ground, keeping your weight on the shoulder blades and your feet.
- Flex the knees, pulling the ball as close to you as you can, contracting the hamstrings.
- After a brief pause, return to the starting position.