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How to do it
- Set the hip pad of a 45-degree back extension bench just below your pelvis.
- Place one foot flat on the platform and stagger the other foot behind it so the front leg carries most of the load.
- Cross your arms over your chest, brace your abdominals, and line up your head, spine and hips.
- Hinge at the hips and lower your torso until you feel the hamstrings of the lead leg lengthen.
- Drive the lead hip into the pad and extend until your body forms a straight line.
- Pause at the top, lower with the same tempo, then repeat and switch the lead leg.
Common mistakes
- Rounding the lower back on the descent, which moves load off the hips and onto passive spinal structures.
- Arching well past a straight line at the top, which compresses the lumbar spine and adds no useful range.
- Letting the trailing foot take an equal share of the load, which removes the unilateral bias entirely.
- Rushing the lowering phase, which cuts time under tension for the glutes and hamstrings.
Muscles worked
- Primary
- Lower Back
- Secondary
- GlutesHamstrings
Good to know
- What muscles does the B-stance Back Extension work?
- Mainly the lower back. It also works the glutes and hamstrings.
- What equipment do you need for the B-stance Back Extension?
- None. It is a bodyweight exercise.
- Is the B-stance Back Extension good for beginners?
- GymVim rates it intermediate. For a beginner-rated exercise on the same muscle and movement, see the Back Extension.