HIP EXTENSION FOR BETTER GLUTESThe unique articulating carriage moves backward & tilts at the same time which encourages the user to push higher on the back. This unique Cybex-patented design provides for more complete hip extension & gluteal involvement. FITS ALLThe start adjustment of the adjustable seat accommodates a wide range of users by adjusting for both user height & range of motion. A GREAT FITThe unique design of the mechanism also means that the VR1 has an exceptionally small footprint making it ideal for space conscious applications.