Powerful exercise machine(power wheel) for your abdomen. Much better than other ab fitness. 14" power wheel (solidly constructed with foot pedals ... to fasteners and latex looped heel fasteners.Instruction manual by fitness expert Jon Hinds, CSCS, CPT, NASM, former strength ... to fasteners and latex looped heel fasteners.Instruction manual by fitness expert Jon Hinds, CSCS, CPT, NASM, former strength ...