The AbMat is a totally one-of-a-kind abdominal exerciser and core trainer because it offers: The full range of motion necessary to work the entire abdominal muscle group. Crunch exercises and most equipment fall short of the AbMat! A variety of exercises that isolate upper and/or lower abs, as well as the obliques and lower back muscles. A safe, comfortable design contoured to your lower back to provide support and to help prevent injury. One size fits all! There is no need to worry about height and weight differences between users. No more balancing! Unlike fitness balls, the AbMat won't roll or wobble on you, so you can focus on your workout