The CAP Ab and Core Mat Pad, Black allows you to work your abdominal muscles through their full range of motion, increasing the results of what could be achieved in a regular sit up or crunch. The use of an Ab Pad allows you to get a full extension of your abdominals by slightly arching your back during exercise, stretching your muscles and not allowing them to relax when in the down position. The CAP Ab and Core Mat Pad offers support and stability while you work out giving your back the support you need to excel.