Lie face up on floor, knees bent with feet on floor and neck straight. Cross arms over chest. Lift legs, keeping knees bent. In a controlled motion, keeping neck straight, curl upper body up and rotate the hips up at the same time. Contract abdominals fully without compromising form. While maintaining the controlled motion, return to starting position. Do not allow muscle to relax before next repetition.
Here are a few suggested alternative exercises:Ab CrunchAb Crunch ObliquesBall Crunch TraditionalDumbbell Side BendsLateral Bend with Barbell