What Is GHR? Glute-Ham Raise vs GHD Machines Explained

What is GHR? It stands for glute-ham raise, an exercise. A GHD, or glute-ham developer, is the machine you usually do it on. With your ankles locked behind rollers and your thighs on a pad, you lower your torso forward, then pull yourself back up, largely by bending your knees. As of Nov 2026, GHDs here list from about $480 to about $755, and they need about 6 feet of floor. They’re often sold alongside benches, which our adjustable bench guide covers, but they do a different job.

GHD vs reverse hyper vs back extension bench

The GHD’s rounded pad and adjustable footplate allow the knee-bending part of the raise, and the same machine does hip extensions and GHD sit-ups. A Roman chair is much cheaper and smaller, but in our judgment it trains back extensions rather than a true glute-ham raise. A reverse hyper is a separate purchase unless you pick a combo such as the Bells of Steel Reverse Hammer or the Hammer Strength combo.

GHD adjustments

Fit changes how the exercise feels, so these specs matter:

• Footplate distance. This sets where your thighs meet the pad. REP Fitness’s GHD has 13 adjustment points and 40 inches from the farthest point to the front of the leg pad. If you’re tall, measure against that.
• Footplate height. Hammer Strength’s Fixed Pad Glute/Ham adjusts vertically for resistance and horizontally for fit. Body-Solid’s SGH500 (retailer listing) moves both ways too.
• Number of settings. Titan’s GHD lists 10, and its floor model lists four ankle and ten leg positions.
• Band pegs and a mounting step. REP Fitness and Body-Solid list both.

GHD footprint and weight

Add room for your torso and for getting on and off. Hammer Strength recommends 110 x 82 inches of live area for its 74 x 34 inch machine. Listed weights run from 100 lb on Titan’s floor model to 411 lb on the Hammer Strength. The floor model also stores upright on its plate, and at 22.75 inches tall it sits much lower than a standard GHD.

Glute-ham raise research on hamstring activity

Direct evidence is thin. These are the abstracts we could read:

Here’s how we’d read it:

• The raise does seem to work the hamstrings hard. McAllister is the direct source, though single reps say little about a real set.
• The hamstrings aren’t equally involved. In that study the semitendinosus was far more active than the biceps femoris. A 2017 study of 24 recreational men found a similar pattern with the Nordic curl, and more biceps femoris with 45-degree hip extension, but its abstract doesn’t name the glute-ham raise.
• Reverse hyper results disagree. Lawrence found more integrated biceps femoris and glute activity on the hyperextension, while Cuthbert found more on the reverse hyper. We wouldn’t pick a winner.
• Injury prevention claims need more support. REP Fitness says strengthening these muscles has been shown to reduce ACL and MCL injuries. None of these studies tested that.

No trial we found compared long-term muscle growth from the glute-ham raise against other hamstring exercises.

Buying criteria

A GHD only earns its floor space if you use it most weeks, so price it against your other hamstring options first.

Models and prices

Safety: spinal loading and muscle damage

Spinal extension. In a 1998 modeling study of 13 young men, active trunk extension produced the highest compressive loads and back muscle activity of the exercises tested. A 2017 study of 16 people found larger back and hip moments in a hip-led back extension than a spine-led one. Neither tested a GHD. A 2026 review ties spondylolysis, a spinal stress fracture, to sports with repetitive loading, extension, and rotation, mostly in adolescents and athletes. It doesn’t address gym machines, so treat this as a reason for caution.

Our practical take is to finish at a straight line instead of arching past it, and to start with a short range. If you have a back condition, get clearance before GHD sit-ups and hyperextensions.

Muscle damage. Severe exertion is a known cause of rhabdomyolysis, a serious breakdown of muscle tissue, so don’t open with a high volume of hard lowering (eccentric) reps; build up over several sessions. MedlinePlus lists dark, red, or cola-colored urine, muscle aching, and weakness among its symptoms, and says to contact your provider if you have them.

The machine itself. Check that the footplate pin is locked and the rollers are snug, and keep the machine on a level floor. Add load only after bodyweight reps feel controlled.