To do the Pilates roll-up exercise, lay on your back on one of the best yoga mats, curl upwards to a seated position, then uncurl your body as you roll back down to lay flat on your back again.

You only need a mat and your body weight to reap the benefits! This form of exercise ... day by signing up for our newsletter, and be sure to follow us on MSN! "[In the roll up, the] rectus ...