Curl-ups

Lie on the floor on your back with your knees bent at a 90-degree angle. Your feet should be flat on the floor, about 12in. from your buttocks.
Cross your arms over your chest.
Slowly contract your abdominal muscles and raise your shoulder blades off the floor.
Keep your head in line with your body-don't press your chin to your chest.
Hold this position for 1 or 2 seconds, then slowly lower yourself back down to the floor. Repeat 8 to 12 times.