The wrist curl is the go-to forearm isolation move — you rest your forearms on a bench and curl the wrists to train the flexors on the underside of the arm. Here's how to do it with good form, the muscles it works, the mistakes to avoid, and how to program it.
The wrist curl is an isolation exercise for the forearm flexors. With your forearms rested on a bench or your thighs and your palms facing up, you let the weight roll toward your fingers, then curl the wrists back up while the forearms stay still. It's a simple, beginner-friendly way to build forearm size and wrist flexion strength. Flipping your grip palms-down gives you the reverse wrist curl, which trains the extensors on the top of the forearm — pair the two for balanced forearms.
The wrist curl isolates the forearm flexors — the muscles on the inner (palm) side of your forearm that bend the wrist. The finger flexors help as the weight rolls into your fingers. The reverse variation shifts the work to the extensors on the top of the forearm.
| Role | Muscles | What they do in the lift |
|---|---|---|
| Primary mover | Wrist flexors | Bend the wrist upward to curl the weight (palms-up) |
| Assisting | Finger flexors | Grip the weight as it rolls toward the fingers |
| Primary (reverse) | Wrist extensors | Bend the wrist upward when done palms-down |
Step-by-step form for the seated wrist curl. Start light — the forearms fatigue quickly and control matters more than load here.
If you want to train the forearms and grip with a different emphasis or tool, these are common swaps:
The wrist curl is an accessory move — slot it near the end of an arm, pull or upper-body day. General starting points:
| Goal | Sets × reps | Notes |
|---|---|---|
| Forearm size | 2–4 × 12–20 | Light-to-moderate load, full stretch and squeeze, train close to failure |
| Balance | 2–3 × 12–15 | Pair with the reverse wrist curl for flexors and extensors |
| Frequency | 1–2× / week | Add a rep or a little weight when you hit the top of the range |
Want to know how hard each set should feel? Read up on RPE to gauge your effort, and pair wrist curls with a heavier grip builder like the farmer's carry.
Log every wrist curl set — weight, reps, and an RPE value — in LiftHero, and it charts your progressive overload and flags personal records so you can see your forearm work adding up over time. You can superset it with a reverse wrist curl, add a rest-timer hold, then drop the pair into a saved routine so it's ready next session. LiftHero records what you log; it doesn't diagnose your form.
It primarily works the wrist flexors on the inner forearm (flexor carpi radialis and ulnaris and the finger flexors). The reverse wrist curl variation targets the extensors on the top of the forearm.
A standard wrist curl is palms-up and trains the flexors on the underside of the forearm. A reverse wrist curl is palms-down and trains the extensors on top. Many lifters train both for balanced forearms.
The forearms respond well to lighter weight and higher reps. Use a load you can control through a full range of motion, and add a little weight or a rep over time rather than swinging heavy.
They train the forearm flexors, which contribute to grip, but they mainly build wrist flexion strength and forearm size. Loaded carries and heavy pulling usually do more for crushing grip.
Higher reps work well — commonly about 12–20 reps for 2–4 sets. Train them at the end of a workout, once or twice per week.
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This guide is educational and not medical advice. Consult a qualified coach or medical professional before starting or changing a training program.
By Meitar Lazimi, founder of LiftHero · Last updated July 9, 2026.