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Crunch - Legs on BenchMuscle: Abdominal Other: NoneType: IsolationLie flat on the floor with your feet resting on a flat bench and your knees bent at a 90-degree angle. Place your hands behind your head and keep your elbows wide so you cannot see them. Exhale as you lift your chest up and your upper back off the floor. Keep your chin off you chest and look straight up. Inhale as you slowly lower your back to the floor but do not touch your upper back to the floor. Perform the movement slowly and do not put tension on your neck.