Back Extension
The back extension on a machine is a controlled, seated movement where you lean back against a pad and return under control. It is an isolation exercise that works your lats, with your obliques helping to keep your torso steady. It suits beginners and regular gym-goers who want a simple, guided way to train the back of the body.
Muscles worked
The Back Extension mainly works your lats, with your obliques helping.
Setting up
- Adjust the seat so the machine's pivot lines up with your hips, then set the back pad so it sits across your mid to lower back, not your neck.
- Choose a light weight to start. You should be able to move through the full range slowly without jerking.
- Sit tall with your feet flat on the footplate or floor, knees roughly hip-width apart, and fasten any seat belt or thigh pad so your hips stay put.
- Cross your arms over your chest or hold the handles if your machine has them. Keep your chin level and look straight ahead.
How to do the Back Extension
- Sit back into the pad with your hips firmly against the seat and your chest lifted.
- Take a breath in and brace your stomach, as if you were about to be nudged in the side.
- Gently draw your shoulder blades down and back, as if sliding them into your back pockets, so you feel your lats switch on.
- Breathe out and lean back against the pad in a slow, smooth movement, stopping when your torso is in a comfortable, upright-to-slightly-back position.
- Pause for a second without forcing yourself further back.
- Breathe in and let the pad return forward slowly over about three seconds, keeping your hips pinned to the seat.
- Stop just before the weight stack touches down, then begin your next rep.
Form tips
- Think about pulling your elbows down and back to feel your lats, rather than throwing your head back.
- Keep your ribs stacked over your hips and your stomach braced so your obliques stop you twisting or leaning to one side.
- Take about two seconds to lean back and three to return. If the weight stack bangs, it is too heavy.
- Keep your hips and bottom planted on the seat throughout. If they lift or slide, lower the weight.
- Use a range of movement that feels smooth and comfortable. More range is not better if you have to strain for it.
Common mistakes
Using too much weight
Drop the load until you can control every rep without jerking. You should be able to pause at the end of each rep.
Throwing the head back
Keep your chin level and eyes forward. Lead the movement by drawing your shoulder blades down and back, not by cranking your neck.
Leaning or twisting to one side
Brace your stomach and keep both shoulders level on the pad. If you still twist, reduce the weight so your obliques can keep you square.
Rushing the return
Let the pad come forward slowly and stop before the weights rest. The controlled return is where much of the work happens.
Sets and reps
| Build strength | 3-4 sets of 6-8 reps with a challenging but controlled weight, resting 90-120 seconds between sets. |
|---|---|
| Build muscle | 3-4 sets of 8-12 reps with a slow lowering phase, resting 60-90 seconds between sets. |
| Fat loss and general fitness | 2-3 sets of 12-15 reps with a lighter weight, resting 45-60 seconds, as part of a wider plan that includes cardio and other strength work. |
Pick a weight where the last rep or two of each set is hard but your form stays clean. When every set feels easy, it's time to go up.
Back Extension alternatives
Machine taken, or want some variety? These work the same main muscles.
Back Extension FAQs
How much weight should I use on the back extension machine?
Start light, with a weight you can move smoothly for 12-15 reps with a pause at the end of each one. Increase in small steps only when every rep looks the same as your first.
Is the back extension machine good for beginners?
Yes, because the machine guides the movement and lets you focus on posture and control. Ask a member of staff to help you set the seat and pad so they fit you properly.
How often can I do back extensions?
Two sessions a week is plenty for most people, with at least a day between them. Stop if you feel pain rather than normal muscle effort, and get it checked.
Track your Back Extension progress
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