Since the unit is explicitly advertised as abdominal trainer, I have to devalue the unit significantly. My wife and I have tried it and have come to the realization that crunches or situps significantly bring more and not end up with a cramp in the back and pain in the knees, as with the belly scooter. The device also does not seem to have a ball bearing inside so that the rollers designed to onerous than expected.
Better ordered you look at these devices:
Ultra Sport Sit Up Bank
Ultra Sport AB trainer, abdominal trainer / AB Roller - foldable, easy to store
