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Dumbbell Jefferson Curl

Intermediate
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A loaded spinal flexion exercise using dumbbells on an elevated surface that targets the erector spinae and hamstrings to build posterior chain strength and improve spinal mobility.

About Exercise

Equipment

Dumbbells, Plyometric Box

Difficulty

3/5 • Intermediate

Primary Muscle Groups

Lower Back, Hamstrings

Secondary Muscles

Abs, Traps

Popularity Score

5

Goals

Strength
Mobility
Stability

Training Style

Functional Training
Mobility Flow

Setup Requirements

Requires Rack

No

Requires Bench

No

Requires Spotter

No

Space Needed

Small

Noise Level

Low

Muscle Breakdown

Lower Back

9/10

Erector Spinae

Hamstrings

8/10

Biceps Femoris, Semitendinosus

Glutes

6/10

Glute Max

Abs

4/10

Transverse Abdominis

Traps

3/10

Lower Traps

Programming

Typical Rep Range

6-12 reps

Rest Between Sets

60-120 seconds

How to Perform

Stand on a stable elevated surface like a plyo box with feet hip-width apart. Hold one dumbbell with both hands in front of thighs or one in each hand with arms extended.

  1. Tuck chin to chest and drop head forward.
  2. Round upper back vertebra by vertebra.
  3. Flex mid-back and lower back segmentally.
  4. Lower dumbbells toward feet with straight arms and slight knee bend.
  5. Pause at maximum flexion without pain.
  6. Unroll spine starting from lower back upward.
  7. Return to upright position with neutral spine.

Coaching Tips

Form Cues

  • Segment vertebra by vertebra.
  • Keep weight close to body.
  • Maintain slight knee bend.
  • Control descent slowly.
  • Engage core throughout.
  • Unroll from bottom up.

Breathing

Inhale during descent to brace core; exhale as you unroll upward.

Tempo

4-2-4

Range of Motion

From full upright neutral spine to maximum comfortable segmental flexion with dumbbells near feet; avoid pain or excessive strain.

Safety

Safety Notes

  • Start with bodyweight or very light loads.
  • Avoid if acute back pain or disc issues present.
  • Consult professional for flexion-intolerant conditions.
  • Maintain control to prevent injury.
  • Stop at first sign of sharp pain.

Spotting

Not typically required; use light weights and focus on form for safety.

Common Mistakes

  • Rushing the movement without control.
  • Allowing weight to drift forward.
  • Using full knee bend reducing hamstring stretch.
  • Hyperextending neck on ascent.
  • Performing with heavy load initially.
  • Ignoring sharp pain signals.

When to Avoid

  • Acute disc herniation
  • Sciatica
  • Flexion-intolerant back pain

Flexibility Needed

  • Adequate hamstring flexibility
  • Spinal segmentation control

Build Up First

  • Master bodyweight cat-cow pose
  • Basic hip hinge proficiency

Also known as

DB Jefferson Curl, Dumbbell Spinal Flexion Curl

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