Primary Muscle Group: Core Muscles
Muscle groups worked in this exercise: Upper and Lower Abdominals
Preparation: Lie on the floor with your arms down at your sides, palms down. Your heels and calves should rest on the top of the ball.
Breathing: Exhale as you lift. Inhale as you relax back to starting point.
Execution: Slowly curl your upper body off of the ground and reach with your arms toward your feet. Hold for a second and then return to the starting position and repeat.