Jefferson Curl
The Jefferson curl is controlled spinal flexion and extension from standing, using a light load and an individually appropriate range.
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How it is executed
- Stand on a sturdy box or platform with a light barbell in front of you.
- Grip the bar at shoulder width and stand tall.
- Slowly tuck your chin and roll down vertebra by vertebra, keeping your knees almost straight, letting the bar hang and slowly lowering it past your toes.
- Stop when you feel a strong but controlled hamstring/lower-back stretch, then reverse the motion segment by segment back to standing.
- Always start light.
Common mistakes
- Bouncing for more depth: move slowly.
- Copying others’ loads: start with minimal weight.
- Continuing through pain: stop the repetition.
Frequently asked questions
- Is it a Romanian deadlift?
- No. The Romanian deadlift uses a hip hinge with a stable spine; here spinal flexion is deliberate. Do not interchange their cues.
- Do you need to stand on a box?
- No. The floor limits depth and allows practice without seeking an extreme range. A platform only makes sense once you control the movement.
- Does it treat lower-back pain?
- This page describes an exercise, not treatment. Pain or injury requires individual assessment of suitability; do not force loaded flexion.
Sources and editorial approach
The explanation, variations and FAQs are Kaizer’s editorial synthesis. ACSM’s 2026 guidance provides general context on progression and resistance training in healthy adults; it does not independently validate the technique of each variation.
No individual professional review is recorded for this page.
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Glossary and calculators
Isolation exerciseAn isolation exercise moves a single joint and concentrates the load on one muscle — the biceps curl, the triceps extension, the leg curl.Maximum recoverable volume (MRV)Maximum recoverable volume is the largest number of weekly sets a client still recovers from before the next session for that muscle.Price per sessionHow much to charge per session
