Exercise guide · evidence-graded

Back Extension

The back extension is done on a 45-degree hyperextension bench: with your hips on the pad and your heels anchored, you bend forward at the hips and raise your torso until your body forms a straight line. It works the glutes, hamstrings and the muscles along the spine, and is one of the most widely used accessories for the back of the body.

Also called: Hyperextension, 45-Degree Hyper, Hip Extension, Roman Chair Back Extension · Equipment: bodyweight · Pattern: hinge

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How to do it

Step by step

  1. Set the hip pad so its top edge sits just below the front of your hip bones, leaving your hips free to bend over it. Hook your heels under the foot pads with your legs straight.
  2. Cross your arms over your chest. For added load, hold a weight plate flat against your chest.
  3. Start with your body in a straight line from head to heels. Brace your trunk lightly and keep your spine long.
  4. Bend forward at the hips under control, taking about two seconds, until you feel a stretch in the backs of your thighs.
  5. Squeeze your glutes and press your hips into the pad to raise your torso, keeping your legs straight.
  6. Finish when your body is back in a straight line from head to heels, with no extra arch in your low back.
  7. Pause for a moment at the top, then start the next rep with the same controlled descent.
Coaching cues
  • Hinge at the hips, spine stays long
  • Squeeze your glutes to lift your chest
  • Finish in a straight line, head to heels
  • Press your hips into the pad
  • Two-second descent every rep
  • Legs straight, heels hooked firmly

In VALDA, these cues are one tap away on the exercise while you train.

Muscles worked

What it trains

MuscleRoleEvidence
Gluteus maximusPrime moverC
Hamstrings: biceps femoris (long head)Prime moverB
Hamstrings: semitendinosusSecondaryC
Erector spinaeSecondaryB
Adductors: adductor magnusSecondaryC
Gluteus medius/minimusStabiliserD

Evidence grades: A = strong research base · B = good · C = limited · D = coaching consensus.

Common faults

What goes wrong, and the fix

Arching past a straight line at the top

Fix: Finish in a straight line from head to heels with a hard glute squeeze.

Pad set too high

Fix: Set the top of the pad just below the front of your hip bones.

Bouncing out of the bottom

Fix: Take about two seconds on the way down and pause before each lift.

Bending the knees

Fix: Keep your legs straight and your heels hooked firmly under the pads.

Rolling the spine up and down each rep

Fix: Keep your spine long and let the movement happen at your hips.

Adding load too quickly

Fix: Progress from bodyweight to a plate at the chest, then a bar across the back.

Programming

What the research says

Rehab & prehab · first choiceGeneral fitness · first choiceEndurance · first choiceMuscle growthSport performance

  • Muscle activity — In an EMG study of trained women, the 45-degree back extension showed glute activity similar to the Romanian deadlift and higher hamstring activity than both the Romanian deadlift and a seated back-extension machine. EMG measures muscle activity, not growth.
  • Spine position — On the Roman chair, a more arched low-back posture raised low-back muscle activity by about 25% in one study, while glute and hamstring activity stayed the same.
  • Load and effort — Research finds muscle growth is similar across a wide range of loads when sets are taken close to failure, so high-rep bodyweight sets and heavier loaded sets can both be productive. True failure adds only a small extra return.
  • Volume and frequency — Research links more weekly sets for a muscle to more growth, with diminishing returns, and training a muscle about twice a week is a common way to spread that volume.
  • Progression — A common loading sequence is bodyweight, then a plate held at the chest, then a barbell across the upper back. No study has compared these progressions directly.
Alternatives · VALDA FLEX

Swap it mid-workout

With VALDA Pro, FLEX offers alternatives like these when you swap an exercise mid-workout.

Log the back extension in VALDA, with these cues one tap away while you train and your history for it in one place.

General information about exercise technique, not medical advice. If you have an injury or a health condition, your healthcare provider is the right person to ask.