Jefferson Curl
A slow, controlled spinal flexion exercise standing on a box and rolling down vertebra by vertebra with a light weight. It trains loaded spinal flexion and posterior-chain flexibility for experienced lifters.
Primary muscles
- Lower Back (Erector Spinae)
- Hamstrings
Secondary muscles
- Glutes (Gluteus Maximus)
- Traps (Trapezius)
- Sets
- 2–3
- Reps
- 5–8
- Rest
- 60–90s
How to perform
Main muscles working (thicker lines)
Starting position
Stand on a sturdy box or step with legs straight, holding a light dumbbell or kettlebell in front of your thighs.
Tuck your chin to your chest.
Slowly roll down one segment of the spine at a time, letting the weight lower towards your toes.
Go only as low as feels controlled, then pause.
Roll back up slowly from the bottom of the spine to the top, lifting the head last.
Breathing: Exhale slowly as you roll down and inhale as you roll up.
Coaching tips
Very slow tempo
One vertebra at a time
Light weight only
Common mistakes
Using too much weight
Rolling down quickly
Bending the knees to go deeper
Safety notes
Start with bodyweight or a very light load and increase only gradually.
Skip this if loaded spinal flexion causes discomfort.
This information is general fitness guidance, not medical advice. Stop if you feel pain and consult a qualified professional.