Start 1. Stand with feet straight and shoulder-width apart, knees slightly bent. 2. Place cables over shoulders and hold hands at chest level. Movement 1. Draw-in belly button, squeeze butt muscles and tuck chin. 2. Crunch upper body forward, rotating torso to one side. 3. Return upper body to upright position, while rotating torso back to start position. 4. Repeat crunch, rotating to opposite direction.