CRUNCH WITH LEGS ON BENCH upper

Lie on your back and place your heels on top of a bench. Cross your arms over your chest and lift your shoulders and upper back off the floor. Lower, but not quite all the way down to the start position.

REVERSE CRUNCH lower

Lie faceup on a bench, firmly grasping the edge of the bench above or alongside your head. With knees bent (and locked in this position), contract your abs to bring your knees in toward your chest, lifting your hips off the bench.

CROSS-OVER CRUNCH oblique (also upper)

Lie on your back, knees bent, hands behind your head. Curl up and, as you rise, angle your left shoulder toward your right hip. Hold at the top for a beat, then return slowly to the start. You can complete all reps for one side before going to the other or alternate from side to side.

SWISS BALL CRUNCH upper

Lie back on a Swiss ball, low and mid back supported, knees bent and feet flat on the floor. With your hands behind your head for support, crunch up, raising your shoulder blades as high as you can. Lower slowly as far as you can, stretching back over the ball.

SWISS BALL PULL-IN lower

Get into a push-up position with your shins and ankles on top a Swiss ball. Keeping your back straight, pull your knees in toward your chest, allowing the ball to roll forward. Hold for a moment and contract your abs, then straighten your legs and roll the ball back to the starting position.

SIDE BRIDGE obliques

Lie on your side with your legs straight and prop yourself up by placing your elbow on the floor directly under your shoulder. With your forearm and ankle in contact with the floor, lift your hip as high as possible without rolling forward or back. Hold for five seconds, the slowly lower to the start position. Complete all reps for one side, then go to the other.