Lie face up on slant board, with feet near floor. Stabilize body by holding on to foot pads. Lift legs up with knees slightly bent. In a controlled motion, curl lower body up by lifting hips off board. Contract abdominals fully without compromising form. While maintaining the controlled motion, return to starting position. Do not allow muscle to relax before next repetition.
Sit sideways on a bench and grasp the edges of the bench for support. With bent knees, raise your legs slightly and then straighten them. Lean backward as balance requires. Next, lift your knees up towards your chest while keeping your lower legs pointed downward and flexing (tightening) your abs as hard as you can. Keep continuous tension on the abs throughout this movement. This works both upper and lower abdominal muscles.