Dumbbell Alternate Seated Hammer Curl
- Target muscle
- —
- Equipment
- Dumbbell
- Body part
- Upper Arms
- Type
- Strength
The dumbbell alternate seated hammer curl is an isolation exercise for the upper arms that builds the biceps along with the brachialis and brachioradialis of the forearm. Using a neutral grip (palms facing each other) and curling one arm at a time while seated, it lets you focus on strict form and add thickness to the arm and forearm.
How to do the Dumbbell Alternate Seated Hammer Curl
- 1Sit upright on a bench with your feet flat on the floor and a dumbbell in each hand, arms hanging at your sides.
- 2Hold the dumbbells with a neutral grip so your palms face each other (thumbs pointing forward).
- 3Brace your core, keep your chest up, and pin both upper arms against your sides.
- 4Curl one dumbbell up toward the same-side shoulder, keeping your wrist straight and the palm facing inward throughout.
- 5Squeeze the biceps and forearm at the top, keeping your elbow tucked and still.
- 6Lower the dumbbell under control back to the starting position with the arm fully extended.
- 7Repeat with the other arm, alternating sides for the full set.
- 8Finish your reps, then set the dumbbells down with control.
Form tips
- Keep your upper arms locked against your torso so the work stays on the arm and you don't swing the weight up.
- Maintain the neutral hammer grip from start to finish — the palms-facing position is what loads the brachialis and brachioradialis.
- Use a slow, controlled lowering phase rather than dropping the dumbbell, to keep tension on the muscle.
- Let one arm rest at the bottom while the other curls, but avoid leaning side to side to help the lift.
- Pick a weight you can curl through a full range with a strict, still elbow.
Common mistakes
- Swinging the torso or using momentum to lift the dumbbell, which shifts work off the biceps and forearm and can strain the lower back.
- Letting the elbow drift forward or flare out, which turns the curl into a partial front-raise and reduces tension on the target muscles.
- Rotating the wrist toward a palms-up position instead of holding the neutral grip, which changes the exercise away from a hammer curl.
- Using too much weight and cutting the range of motion short, so the biceps and forearm never work through the full curl.
- Bouncing out of the bottom instead of fully extending and pausing, which steals tension and reduces the training effect.
Frequently asked questions
What muscles does the dumbbell alternate seated hammer curl work?
It works the upper arms, training the biceps along with the brachialis and the brachioradialis of the forearm. The neutral hammer grip places extra emphasis on the brachialis and forearm compared with a standard palms-up curl.
Why curl one arm at a time instead of both together?
Alternating lets you focus on one arm per rep with stricter form and gives each side a brief rest, which can help you keep tension high and avoid swinging the weight up with your body.
What's the difference between a hammer curl and a regular biceps curl?
A hammer curl keeps a neutral grip with the palms facing each other, while a regular curl uses a palms-up grip. The neutral grip shifts more work onto the brachialis and brachioradialis, helping build arm and forearm thickness.
Is the seated hammer curl good for beginners?
Yes. Sitting upright limits body swing and makes it easier to learn strict form, and the neutral grip is comfortable on the wrists. Start light and focus on a still elbow and full range of motion.
How many sets and reps should I do?
For building the arms, 3–4 sets of 8–12 reps per arm is a sensible default. Use a weight you can curl with strict form and a controlled lowering phase.
