Position thighs prone on upper padding of 45-degree hyper-extension apparatus. Hook heels on platform lip or under padded brace. Place barbell on back of shoulders and grasp bar to sides.
Lower body by bending hips until fully flexed. Raise or extend hips until torso is parallel to legs. Repeat.
Position pad high enough to evenly distribute body weight on thigh but not so high that range of motion is limited; abdomen should not press on top side of pad when upper body is lowered. Maintain barbell's position on back of shoulders when upper body is lowered. Do not lower weight beyond mild stretch. Full range of motion will vary from person to person. Also known as Barbell 45-degree Hip Extension. Also see Barbell Hyperextension and Barbell Back Extension.