Tune Up Your Trunk
Find out how to tone and strengthen your abs, obliques, and back By RealAge
1. Ab Curl
Sit on the exercise ball, feet flat on the floor, knees hip-width apart and bent at a 90-degree angle. Place your hands behind your head, elbows pointed out, and slowly roll back until your mid to lower back rests on the ball. Pull your ribs toward your pelvis to raise your upper back 3 to 4 inches off the ball. Hold for a second and then return your shoulders to the ball. Repeat 10 times.