Commercial GHD (Glute Ham Developer) / 20" Horizontal Knee Pad / 4 Floor Mounting Holes / Strengthen Core, Back & Hip Flexors One key component we included is the 20 " horizontal knee pad that sits below the hip pads, and provides the base you need when performing Glute Ham Raises, the original exercise the machine was intended for. We also included a simple single bolt action adjustment feature, to quickly and easily allow any athlete to modify the distance between the hip (8 options) and foot pads (5 options) to fit their size. Heavy enough and built with a support system that provides a sturdy platform to work above, whether you are repping out sit-ups for speed, or performing raises with added weight, our Commercial GHD will stay planted firmly on the ground and keep you charging through your WOD. Though our machine is smaller in stature than some - we made sure to get rid of all the unnecessary extras to save you on space, while incorporating key components that others leave out. Split 3" channel between butt and foot pads.