Movement Practice WOD
exercise wod
AMRAP 12
8 controlled reps
10 bodyweight reps
200m easy run or 60 sec cardio
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
Back Extension is best used when the workout goal matches its main demand: bodyweight capacity, clean mechanics, and scalable intensity.
Muscles Worked
Erector spinaeGlutesHamstrings
Equipment
GHD, Roman chair, or floor
Best For, Avoid If, and Scaling
| Best for | Bodyweight WODs, skill practice, and athletes who can keep back extension mechanics consistent under fatigue. |
|---|---|
| Avoid if | Pain changes your movement pattern, fatigue makes reps sloppy, or the workout asks for a standard you cannot repeat safely. |
| 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.
Related WODs
Use Back Extension in a Real Workout
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Technique + Conditioning
scaled workout
4 rounds for quality
10 technique reps
30 sec core hold
12 low-skill conditioning reps
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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