Exercise guide
Dumbbell Single Arm Wrist Curl
- Beginner
- Isolation
- Rep-based
- Lower arms
This isolation exercise specifically targets the wrist flexors on the underside of the forearm to build grip strength and forearm mass. Working unilaterally allows for a greater mind-muscle connection and helps correct strength imbalances between arms.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Sit on a bench and hold a dumbbell in one hand with an underhand (supinated) grip.
- Rest your forearm flat against your thigh or the edge of a flat bench, allowing your wrist to hang off the edge.
- Position your feet firmly on the floor and use your non-working hand to stabilize your body if needed.
How to do it
- Inhale as you slowly lower the dumbbell toward the floor by extending your wrist as far as comfortably possible.
- Exhale as you curl the dumbbell upward by flexing your wrist, bringing the weight toward your forearm.
- Squeeze the forearm muscles at the peak of the contraction for one second.
- Lower the weight back to the starting position using a controlled 2-second tempo.
Form checklist
- Keep your forearm glued to your thigh or the bench; do not let the elbow lift.
- Ensure the movement comes strictly from the wrist, not the bicep or shoulder.
- Move through a full range of motion, from a deep stretch at the bottom to a full squeeze at the top.
- Maintain a neutral spine and avoid leaning into the movement to create momentum.
Pro tips
- At the bottom of the movement, allow the dumbbell to roll slightly down into your fingertips to maximize the stretch on the flexors.
- Focus on 'rolling' the weight back into your palm before initiating the actual wrist curl to engage the deep finger flexors.
Make it harder
- Increase the eccentric phase to 4 seconds to maximize time under tension.
- Add a 5-second isometric hold at the top of every third repetition.
Frequently asked
- What muscles does the dumbbell single arm wrist curl work?
- The dumbbell single arm wrist curl primarily targets the forearms.
- What equipment do you need for the dumbbell single arm wrist curl?
- The dumbbell single arm wrist curl uses dumbbell.
- Is the dumbbell single arm wrist curl good for beginners?
- Yes. The dumbbell single arm wrist curl is a beginner-friendly movement and a strong foundation to build on.