Ffittech Glute Ham DeveloperFfittech Glute Ham Developer The Ffittech Glute Ham Developer, also known as a GHD or GHR, is an essential training tool for athletes and the perfect piece of equipment to target the posterior chain which consists of the following key muscle areas: glutes, hamstring, upper and lower back, calves and core. This GHD machine is perfect for moves such as the back extension (glute or back focused) and hip extension. Perfectly suited to the commercial gym