Wide-Leg Jefferson Curl on Box
Primary Targets:
• Hamstrings
• Adductors
• Spinal erectors (eccentric)
• Glutes
Classification:
👉 Loaded end-range flexion (segmental)
Starting Position
• Stand on a plyo box / low platform.
• Feet wide in a straddle stance.
• Toes slightly out or neutral.
• Hold a dumbbell, kettlebell, or barbell hanging in front of you.
• Stand tall.
Execution
Tuck your chin and slowly curl the spine down one vertebra at a time.
Let the weight hang toward the floor.
When your spine is fully flexed, hinge a little deeper from the hips.
Go only as far as you can control.
Reverse the motion: hips → low back → mid back → upper back → head.
Key Cues
• “Slow and smooth.”
• “Segment the spine.”
• “No bouncing.”
• “Control the bottom.”
Tempo & Volume
• 5–8 sec down
• 2–3 sec pause
• 5–8 sec up
• 4–8 reps
• 2–3 sets
Progressions
• Deeper range
• Slower tempo
Regressions:
• Smaller range
Why It’s Huge for Pancake
✔ Builds usable flexibility
✔ Strengthens hamstrings & adductors at long length
✔ Trains spinal control
✔ Transfers to deeper forward folds and pancakes