15-Minute Full-Body Exercise-Ball Workout
Move 4: Crunch
(A) Lie on the ball with your middle back resting on top, arms straight, and palms on your upper thighs. (B) Curl your upper body forward, one vertebra at a time, keeping your hands on your thighs. Lower to the starting position. Repeat 15 times.
So maybe you can’t change your health overnight. But you can get a head start.