Lying face down on the floor with your arms stretched on the floor above your head and hold the stability ball in your hands, keep your legs flat on the floor, raise both your arms and legs up at the same time bringing your head off of the floor as you arms raise, bring your hands and legs together passing the ball from your hands to your feet and then slowly lower them down again until you are back in the start position, when you bring your hands and feet back up the next time pass the ball back into your hands from your feet.
Tips
Make sure you squeeze those abs as you pass the ball from hands to feet and feet to hands.
