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glute ham developer

The glute-ham developer (GHD) sit up is an oft misunderstood exercise. Watch this video to see the difference between a badly executed GHD sit up and one done properly.
The Glute-Ham Developer (GHD) is one of the most effective training tools available. This video outlines the proper form for two popular movements, the GHD Sit Up and the GHD Hip Extension.