Strength legend Louie Simmons swears by the reverse-hyper machine he invented after breaking his back. In this two-part video, Kelly Starret explains why the device works and why you might want to put it in your gym.
According to Starrett, the reverse hyper helps people figure out how to 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.
Going deeper into the movement, Starrett explains what happens in the body when you use a reverse hyper and how it can restore spinal movement and improve disc health.
Additional reading: Spine Mechanics for Lifters by Tony Leyland, published Nov. 1, 2007.