Back Extension Strength Builder
back extension strength workout
Every 3:00 x 5 sets
5 Back Extension reps at RPE 6-7
Stop with 2-3 good reps in reserve
Rest for the remainder
Bodyweight
Back Extension — CrossFit Accessory Technique Guide
BB
By Borja Bes — CrossFit Athlete & Hyrox Finisher
The back extension is a foundational posterior-chain accessory exercise for CrossFit athletes. It trains the spinal erectors and glutes to maintain posture and resist fatigue, which matters in deadlifts, Olympic lifts, rowing, and gymnastics arch positions. In a glossary, it deserves its own page because it is more specific and scalable than a generic “lower back exercise” label. Whether done on a GHD, Roman chair, or floor variation, the goal is controlled extension with glutes and trunk working together.
Quick answer
The back extension is a foundational posterior-chain accessory exercise for CrossFit athletes. Train Back Extension in controlled sets with enough rest to keep every repetition mechanically consistent.
Curated demonstration
Watch Back Extension Technique
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STOP Doing Back Extensions Like This!
Squat University · reviewed 2026-08-06
Muscles Worked
Erector spinaeGlutesHamstrings
Equipment
GHD, Roman chair, or floor
Best For, Avoid If, and Scaling
| Best for | Building measurable Back Extension strength and control through erector spinae and glutes, especially when quality repetitions matter more than workout speed. |
|---|---|
| Avoid if | Avoid or scale Back Extension if pain changes the movement or the intended position cannot be controlled. Correct this common fault before adding volume: finishing in excessive lumbar extension instead of neutral. |
| Scaling | Floor supermans, reduced range, or assisted machine reps. |
How to Do the Back Extension
1
Set up on the machine or floor with the hips supported and spine neutral.
2
Lower the torso under control without collapsing.
3
Extend back to neutral by driving through the glutes and spinal erectors.
4
Finish tall without hyperextending the lower back.
Common Mistakes
✕
Finishing in excessive lumbar extension instead of neutral.
✕
Moving too quickly and turning the exercise into a hinge swing.
✕
Losing glute tension and putting all the load into the low back.
Coaching Tips
✓
Think “finish tall” rather than “lean back.”
✓
Back extensions pair well with hollow-body work to build balanced trunk capacity.
Scaling Options
Easier / Beginner
Floor supermans, reduced range, or assisted machine reps.
Harder / Advanced
Weighted back extensions, tempo reps, or single-leg variations.
Training Examples
Train Back Extension with a Clear Purpose
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Back Extension + Superman Hold Quality Pairing
back extension accessory session
4 rounds for quality
5 Back Extension reps at RPE 6-7
8 controlled Superman Hold reps
Rest 60-90 sec between rounds
Frequently Asked Questions
Are back extensions mainly for the lower back?
They train the spinal erectors, but strong reps also rely on the glutes and hamstrings. Done well, they build posterior-chain endurance more than isolated “low back strength.”
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Useful next steps
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