Glute Ham Developers (GHD) are superior conditioning machines that target the posterior chain and midline stabilisation. Morevoer, GHD training allows one of the only safe ways to actively train your spinal erectors. GHD sit-ups also result in one of the most powerful abdominal contractions of any movement in the gym. The midline stabilization gained acts like an intrinsic weight belt protecting the spine. The Aplhastate GHD offers superior stability while you exert maximum power in either extensions or crunches. This portable piece offers a smooth adjustment system to accommodate athletes of different sizes.