Fast and Easy -targets those hard to control abdominal muscles as well as shoulders and arms -only requires minutes a day, (fitting your workout into 3 minutes!) -does not require complicated motion or confusing routines Versatile -the AB dolly II provides a good workout for beginners and advanced users alike -the free range allows users to target the sides as well as the middle of the stomach region -because there is no track, you can choose how much you want to work the muscles; as you advance so does your daily routine!