Instructions

Lie with your back on the floor and place a swiss ball between your lower legs. Squeeze your legs into the ball to ensure a tight grip. Raise your legs so that they form a 90 degree angle with your body. Keeping your legs straight, and your arms on the floor by your sides, slowly lower your legs towards the floor. Only go as low as you can maintain the natural curve in your back. Raise your legs back to the starting position to repeat.