It's a combination inverted back extension and oblique flex, set at an exact 45° angle for ultimate conditioning It'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 pads for comfort and support. Over-sized 8" foam rollers hold you securely in place. Fully adjustable 4" thick midsection pads provide maximum comfort for all size users.