Back Extension

Secondary muscles
Glutes, Hamstrings
Body part
Back
Position
Prone
Laterality
Bilateral (both sides together)
Category
Strength

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On the angled hyperextension bench, thighs anchored on the pad, the movement bends purely at the hips and lower back while gravity supplies the resistance. It scales simply, arms crossed to start, hands behind the head later, a plate hugged to the chest after that, which keeps it useful from beginner onward.

How to do the Back Extension

  1. Adjust the hyperextension bench so that your upper thighs are resting on the pad and your feet are secured.
  2. Cross your arms over your chest or place your hands behind your head.
  3. Lower your upper body towards the ground while keeping your back straight.
  4. Pause for a moment at the bottom, then raise your upper body back up until it is in line with your legs.
  5. 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

GoalSets × repsRest
Strength4–5 × 3–62–3 min
Muscle growth3–4 × 6–1290–120 s
Endurance2–3 × 12–2060 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 bodyweight

Easier and harder

Frequently asked questions

What muscles does the Back Extension work?

The Back Extension primarily works the spine. It also involves the glutes and hamstrings, which assist the movement and stabilise the joints.

Is the Back Extension good for beginners?

Yes. The Back Extension is rated beginner: it uses no equipment beyond your bodyweight 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 Back Extension?

If you cannot do the Back Extension, try the Flat Bench Hyperextension, the Prone Back Extension or the Machine Back Extension. 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 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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