Strength legend Louie Simmons swears by the reverse-hyper machine he invented after breaking his back. The reverse hyper (also known as the reverse back extension in its early days) helps people stabilize the body while moving the hip independently. It can also come in handy if you want to get an injured athlete doing hip extension without knee flexion. The reverse hyper can restore spinal movement and improve disc health. -The standard hyper (back extension) brings the spine (torso) into line with the blocked pelvis and femur on the GHD or roman chair using the spinal erectors. The reverse hyper (back extension) brings the pelvis and femurs into line the blocked spine (torso) using the spinal erectors.