with your knees bent and your feet flat on the floor. Start with your elbows bent and your hands behind your head.
Starting with your right arm, reach across your body to the opposite knee. Rotate your torso smoothly, alternating arms and reaching as far as possible.
Your abdominal muscles should be tight and you should be using an easy, rocking motion, keeping your head lifted slightly off the floor. Keep your hips flat on the ground and make sure you reach as far as possible to the outside of the opposite thigh. Do as many repetitions as possible in a 45-second period of time.