Machine Back Extension
Also known as: machine hyperextension
- Secondary muscles
- Glutes, Hamstrings
- Body part
- Back
- Position
- Prone
- Laterality
- Bilateral (both sides together)
- Category
- Strength
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Working against a pad and a weight stack lets you load the extension in precise increments and start lighter than bodyweight versions allow, something no hyperextension bench offers. The seated setup also fixes your range of motion, making it the simplest place in this family to learn the movement.
How to do the Machine Back Extension
- Adjust the machine to fit your body size and range of motion.
- Sit on the machine with your back against the pad and your feet secured.
- Place your hands on the handles or grip bars.
- Engage your core and slowly lean forward, allowing your back to round slightly.
- Pause for a moment at the bottom position, feeling a stretch in your lower back.
- Using your back muscles, slowly raise your torso back to the starting position.
- Repeat for the desired number of repetitions.
Tip: Keep the neck neutral and look at the floor a few feet ahead of you, not up at the ceiling.
Muscles worked
Primary
Spine · Back
The spinal erectors work both to hold the back in a rigid position and to bring the torso up, and you should feel a burn along both sides of the lower back.
Secondary
- Glutes — The glutes drive the hip extension that lifts the torso, and rounding the upper back slightly with a pelvic tuck shifts more of the work onto them.
- Hamstrings — The hamstrings assist hip extension and get more of a stretch the straighter your legs are on the pad.
Common mistakes
- Hyperextending at the top — the goal is a straight line from head to heels, not an arch; stop when the torso is level with the legs.
- Pad set too high — if the pad sits above the hip crease it blocks the hips from folding and forces the lower back to do all the bending; set it just below the hip bones.
- Using momentum — swinging the torso up fast turns it into a bounce; take two or three seconds on the way down and lift smoothly.
- Adding weight too early — bodyweight sets of 15 with a full pause at the top should feel easy before you hold a plate.
Sets, reps and where it fits
| Goal | Sets × reps | Rest |
|---|---|---|
| Strength | 4–5 × 3–6 | 2–3 min |
| Muscle growth | 3–4 × 6–12 | 90–120 s |
| Endurance | 2–3 × 12–20 | 60 s |
Back extensions are a good accessory after deadlifts or squats, or a stand-alone lower back builder on an upper body day. They pair well with a hamstring curl or a reverse hyperextension on adjacent equipment.
Variations and alternatives
Similar exercises
Without machine
Frequently asked questions
What muscles does the Machine Back Extension work?
The Machine Back Extension primarily works the spine. It also involves the glutes and hamstrings, which assist the movement and stabilise the joints.
Is the Machine Back Extension good for beginners?
Yes. The Machine Back Extension is rated beginner: it uses a machine and the movement is simple to learn. Start light, focus on the full range of motion and add load once every rep looks the same.
What can I do instead of the Machine Back Extension?
If you cannot do the Machine Back Extension, try the Prone Back Extension, the Back Extension or the Flat Bench Hyperextension. Each of them trains the spine through a similar movement, so you can swap them in without changing the rest of the workout.
How many sets and reps should I do?
It depends on your goal. For the Machine Back Extension, a sensible starting point is strength: 4–5 × 3–6 with 2–3 min rest; muscle growth: 3–4 × 6–12 with 90–120 s rest; endurance: 2–3 × 12–20 with 60 s rest. Put it early in the session while you are fresh, before isolation work for the same muscles.
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