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Machine

Seated back extension machine

The seated back extension machine lets you work your back while being supported. You sit down, brace yourself, and push the pad back with your torso. It’s a simple movement that suits people who prefer a guided option instead of floor exercises.

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Extension lombaire assise

The essentials

  • Push the pad back with control.
  • Stop when your body is straight; don’t overextend.

Muscles worked

Primary
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Setup

  1. Set the seat height so the machine’s pivot lines up roughly with your hips.
  2. Adjust the pad or backrest so it rests on your upper back, not on your neck.
  3. If there’s a belt or support pad for your hips, tighten it enough to keep your pelvis glued to the seat.
  4. Pick a weight that lets you move smoothly with full control, no jerking.
  5. Place your feet flat on the platform, about hip-width apart, in a stable stance.

How to do it

  1. Sit all the way back on the seat, pelvis against the pad, chest up and back supported.
  2. Grab the handles if your machine has them, lightly brace your abs, and look straight ahead.
  3. Breathe in, then slowly push your torso backward against the pad until you reach a comfortable range allowed by the machine, without snapping into extension.
  4. Pause briefly at the end of the movement while keeping tension, without collapsing onto the machine.
  5. Return to the starting position in about 2 to 3 seconds, controlling the way forward instead of letting the weight pull you.
  6. Repeat for your set, keeping the same tempo and range, with no bouncing at the end of the motion.

Common mistakes

  • Overarching the lower back

    Instead : Stay within the machine’s intended range and stop before you feel any sharp pinch or excessive pressure in the lower back. Aim for a smooth, controlled arc, not the biggest range possible.

  • Letting the machine pull you forward

    Instead : Keep tension throughout the whole rep. Control the way back to the start over 2 to 3 seconds instead of suddenly relaxing and dropping the weight.

  • Hips lifting off the seat

    Instead : Keep your hips glued to the seat and, if there’s a belt or hip pad, snug it enough to lock your pelvis down. If your hips still lift, lower the weight.

  • Doing most of the work with the arms

    Instead : Use the handles only to stabilize yourself. Hold them just firmly enough to stay in place and focus on moving from your torso, not from your shoulders.

Coach tips

  • Use a controlled rhythm: around 1 second to extend back and 2 to 3 seconds to return forward.
  • Breathe out as you push the pad back, and breathe in as you come back to the starting position.
  • If you’re new to this machine, start with a smaller range of motion and build it up gradually as it feels comfortable.
  • If you feel sharp or unusual back pain, stop right away and talk to a healthcare professional before you do more.

Variations

  • On some machines you can set the starting angle more forward or more upright to match your comfort and mobility.
  • If the design allows, you can slightly adjust the backrest position to find the angle where you feel your back working without discomfort.

Sets and reps

People often use the seated back extension machine for 2 to 4 sets of about 10 to 15 reps, with a load they can control from start to finish. It commonly shows up in the middle or toward the end of a trunk or back workout.

Exercises on this machine

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Common questions

What is the seated back extension machine for?

The seated back extension machine is used to work back extension with support and a guided path. It lets you focus on moving your torso without having to manage balance like with floor-based variations.

Is the seated back extension okay if I already have back pain?

If you already have back pain or a past back injury, stop as soon as you feel sharp pain and talk with a healthcare professional before continuing. The machine guides the motion, but it doesn’t replace individual medical advice.

Do I have to use the full range of motion?

No. You can stay in the part of the range where you feel strong and comfortable. Over time, many people gradually increase their range of motion as it feels good for them.

Where should my feet go on the back extension machine?

Place your feet flat on the foot platform, about hip-width apart, in a stance where you feel stable without having to tense your legs hard just to stay in place.

Updated October 27, 2026 · The GoSet team

This guide does not replace a training or health professional. If something hurts, stop and ask for advice.