Muscles worked: Abdominals and Obliques
Purpose: Strengthen and stabilize
Form: Lie on your back with your knees bent. Place feet flat on the floor. Grasp the ball with both hands. Contract/crunch your abdomen by rolling your upper torso forward. At the same time, reach with the ball (arms fully extended) toward the side of the RIGHT knee. Exhale as you reach with the ball. Return to the starting position, repeat to the side of the LEFT knee. Alternate each side.
Special considerations: To really get the most out of this exercise, try to hold the ball near the knee for a second or two, then return to the starting position.