Lie flat on your back with legs straight and arms stretched overhead, holding a medicine ball with both hands. Use your core to lift your hands and feet simultaneously toward the ceiling until your body is in a “V” position. At the top of the “V,” pass the ball from your hands to your feet. Holding the ball between your feet, slowly lower your arms and legs down to the floor. Raise your body back into a “V,” pass the ball from your feet to your hands and return to the start position. That’s one rep