5. Swiss Ball Crunch
Lie back on the Swiss ball Opens a New Window. with feet shoulder-width apart on the floor. Your lower back should be supported by the ball. Place your hands behind your ears and tuck your chin. Curl your body up off the ball until you’re sitting up.
6. Dip/Leg Raise Combo
Suspend yourself over the parallel bars at a dip station. Bend your knees slightly and raise your legs in front of you until they’re parallel to the floor. This will build you a magazine-worthy six-pack.