for abdominals

The device Ultra Sport is not too difficult and the roll is slightly rubberized, can be so theoretically trained directly on floor. However, I would always recommend the additional purchase of a rubber mat, otherwise pain knees quickly.
The build quality is good, the role of smooth rolling and there is no danger that the device tilts to side. My 60 kilos keeps your device from easy.

A brief guide to the handful of exercises that can be performed with this device, also is included.