Touted by Joe Rogan as awesome for back injuries, the reverse hyper machine is said to work by decompressing the spine and the intervertebral discs, therefore providing a way to rehab an injured back and reduce muscle-tightness.
It is also used to develop the glutes, hamstrings and lower back. In the UK the machine can be purchased from strengthshop.
The machine is said to both relieve pressure in the lower back and increase blood circulation to the area. The inventor is the famous Louie Simmons of Westside Barbell.