(CPO) Biodex BioStep 2(CPO) Biodex BioStep 2 Certified Pre Owned The elliptical motion of the BioStep 2 is naturally smooth and continuous; very different from the stuttering stop start motion associated with other recumbent steppers. The step through frame, simple easy to see and use display and comfortable, robust design make the BioStep 2 the obvious choice for cross training. The BioStep 2 incorporates both the upper and lower extremities into the cycling motion, so