It's a combination inverted back extension and oblique flexor set at an exact 45° angle for ultimate conditioning. t's a combination inverted back extension and oblique flexor set at an exact 45° angle for ultimate conditioning. Strengthen your lower back safely and comfortably on the strongest 45° Hyper available. This combination Inverted Back Extension and Oblique Flexor is set to an exact 45° angle for optimum conditioning. Telescoping midsection pads adjust to all size users and feature thick, double stitched DuraFirm"! pads for comfort and support.