We have made this slightly bigger and firmer than the original allowing more lumbar support and durability. Strong abs go hand-in-hand with a strong back. Get total trunk protection with the ultimate core trainer. This one of- a-kind abdominal exerciser and core trainer offers the full range of motion necessary to work the entire abdominal muscle group. 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 Ab Mat won't roll or wobble on you, so you can focus on your workout A compact, portable design that requires no set-up or tear-down. Take it with you anywhere!