HOW: Begin this exercise laying face down with your feet anchored onto the GHD with the pads of the GHD on your upper thigh. From this position, remove one leg from being anchored on the GHD and assume a plank position keeping your body parallel with the floor. Hold this position for the prescribed amount of time
FEEL: You will feel the muscles in your posterior chain working including your hamstrings, hip muscles and back muscles.
COMPENSATION: Avoiding arching at the back or allowing your chest to fall towards the floor.