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Stability Ball Pull-InMain Muscle: Abdominals Mechanics Type: Compound Place your hands on the floor with your hands directly under your shoulders. Place your shins on a stability ball. You should look like you are doing a push-up on the floor. While keeping your core tight and back flat, pull the stability ball towards your chest by bending the knees. The stability ball will roll from the shins to ankles as your abs do the work. Hold for a second and roll the ball out until your legs return to starting position. Focus on proper breathing and do not hold your breath.