Overview

The dumbbell behind back wrist curl is an isolation exercise targeting the forearm flexors, performed by holding a dumbbell behind the thighs with palms facing backward. This variation emphasizes wrist flexion with a unique angle, building grip strength, forearm thickness, and endurance while complementing extensor movements for balanced development.​

Target Muscle Groups

• Primary: Flexor carpi radialis, Flexor carpi ulnaris, Flexor digitorum superficialis

• Secondary: Palmaris longus, Brachioradialis, Finger flexors​

How to Perform Dumbbell Behind Back Wrist Curl

Setup

1. Stand with feet shoulder-width apart, knees slightly bent.

2. Reach both hands behind your thighs or glutes and grasp a dumbbell with an underhand grip (palms facing up/away from body).

3. Allow wrists to fully extend over the dumbbell, resting it on your fingers.

4. Keep elbows close to sides, shoulders relaxed, and core braced.​

Execution Steps

1. Start with wrists fully extended (dumbbell hanging low).

2. Curl wrists upward by flexing them, lifting the dumbbell toward forearms.

3. Squeeze forearm flexors at the top for 1-2 seconds.

4. Slowly lower dumbbell back to full extension with control.

5. Repeat for desired reps, maintaining wrist-only movement.​

Tips for Proper Form

• Use one moderate dumbbell to ensure control.

• Keep upper body stable; no swinging or leaning.

• Focus on full range: maximum flexion to extension.

• Breathe out on curl, inhale on lower.

• Higher reps (15-25) maximize forearm pump and endurance.​

Common Mistakes to Avoid

• Using momentum from hips or torso.

• Allowing elbows to flare outward.

• Incomplete wrist extension at bottom.

• Gripping too tightly, limiting flexor isolation.

• Rushing tempo; prioritize slow eccentrics.​

Benefits

• Isolates forearm flexors with natural behind-back angle.

• Enhances grip strength for deadlifts and pulls.

• Builds forearm size and vascularity.

• Addresses imbalances with unilateral capability.

• Joint-friendly for wrist training variety.