Fitball Leg Curl

Lie on the floor on your back with straight legs on the ball. Position the ball so that the ankles of your outstretched legs are on top of the ball. This will be your starting position. Raise your buttocks off the floor, keeping your weight on your shoulder blades and legs. The body is in a straight line. Bend your knees, rolling the ball with your heels as close to your buttocks as possible. After a short pause, return to the starting position.