Floor Crunch

Set Up: Lie faceup ona mat with your head, shoulders and torso on the floor and your heels and calves resting on top of a stability ball. Place your hands behind your head, elbows flaring out to the sides.

Action: Contract your abdominals as your curl your torso upward, lifting your head and shoulders from the ground but keeping your lower back on the floor. Slowly lower yourself back down and repeat.