No More Flabby Abs.

They'll strengthen and tone the rectus abdominis, the muscle that stretches from your ribs to your hips, and the obliques, the muscles that run down the sides of your torso. Do two sets of 10 to 12 repetitions, with a 1-minute break in between

Hip Lift
Lie on your back with your arms by your sides, palms facing up. Raise your legs so they are straight up toward the ceiling and perpendicular to your torso.

Pull your navel toward your spine and lift your hips a few inches off the floor, keeping your legs pointed straight up. Then slowly lower your hips back to the floor.

Torso Twist
Sit on the floor with your knees bent and feet flat, about hip-width apart. Extend your arms straight in front of you, and lace your fingers. Tighten your abdominal muscles and lean back about 45 degrees toward the floor.

With your abs taut, rotate your torso toward the right as far as comfortably possible. Be sure to move your upper body (head, shoulders, arms, chest, and abs) in unison; don't lead with your arms. You should be looking in the same direction your hands are pointing throughout the move. Hold, then return to center and twist to the opposite side. That's one rep.