Here is a modified version of the Glute Ham Raise using a power band and a harness. Feet are anchored under the squat rack. Hips must remain in full extension throughout the descent and ascent actions. The pace of this video is sped up 4 X for the first two reps (to fit on instagram) and the third rep is in normal time. This exercise trains hamstring strength when the hips are extended fully. Once you start to flex forward at your torso, you are cheating by using your hip flexors. A tough exercise!
sydneystrengthconditioning.com