The glute-ham developer (GHD) sit up is an oft misunderstood exercise. It is actually an explosive movement and should not be done slowly. Watch this video to see the difference between a badly executed GHD sit up and one done properly.

Point of instruction:
  • Sitting in the proper place on the seat pads
  • Proper positioning of the neck
  • Bigger range of motion
  • Explosive movement and involving the legs on the way up