Single Arm Dumbbell Seated Hammer Curl
In SetGrip: Dumbbell Seated Hammer Curl (Single Arm)
- Secondary muscles
- Forearms
- Body part
- Upper Arms
- Position
- Seated
- Laterality
- Unilateral (one arm at a time)
- Category
- Strength
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Bracing your elbow against your inner thigh turns the hammer curl into a concentration-style movement: neutral grip, one arm, and a fixed pivot point. The setup allows no swing at all, so the brachialis does the lifting, which usually means a smaller dumbbell than your standing hammer curls, moved with more precision.
How to do the Single Arm Dumbbell Seated Hammer Curl
- Sit on a bench with your back straight and feet flat on the ground.
- Hold a dumbbell in one hand with a neutral grip (palms facing each other).
- Rest your elbow on the inside of your thigh, just above the knee.
- Keeping your upper arm stationary, exhale and curl the dumbbell up towards your shoulder.
- Pause for a moment at the top, squeezing your biceps.
- Inhale and slowly lower the dumbbell back to the starting position.
- Repeat for the desired number of repetitions, then switch arms.
Tip: Lower for three seconds and stop just short of locking out the elbow to keep the muscle under tension.
Muscles worked
Primary
Biceps · Arms
The biceps bend the elbow and turn the palm up, so they work hardest when the palms face up; hammer and reverse grips shift more of the work to the forearm muscles.
Secondary
- Forearms — The brachioradialis and forearm flexors take over on hammer and reverse curls and assist on every other variation.
Common mistakes
- Elbows drifting forward — as the elbows come up the front delt starts to lift the weight; pin the elbows to your sides and let only the forearm move.
- Swinging from the hips — a small rock backward on each rep means the weight is too heavy; drop it and curl from a dead stop.
- Cutting the bottom short — stopping with the elbow bent shortens the range where the biceps are stretched; lower until the arm is nearly straight.
- Wrists curling at the top — flexing the wrist toward you brings the forearm flexors in; keep the wrist neutral or slightly extended.
Where it fits in a workout
Curls go at the end of a pull session or arm day, after the rows and pulldowns that also load the biceps. Superset them with a triceps pushdown or extension.
How many sets, how heavy and how hard: see what the ACSM position stands support.
Variations and alternatives
Similar exercises
Without dumbbell
When to talk to someone
- Chest discomfort, feeling faint or lightheaded, or trouble breathing during or after exercise can be signs of a heart attack. In the US, call 911 right away; elsewhere, call your local emergency number.
- Heart, metabolic or kidney disease, or symptoms like these when you are active: talk to your doctor before you start or step up training.
- Pregnant: ask your obstetric care provider which exercise suits you.
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More exercises
Sources
- ACSM position stand on exercise quantity and quality (Garber et al., 2011)
- ACSM preparticipation health screening (Riebe et al., 2015)
- ACOG Committee Opinion No. 804 on exercise in pregnancy (2020)
- CDC: About Heart Attack Symptoms, Risk, and Recovery (2024)
Sources checked on October 17, 2026. Full citations are in the exercise library.
Animation and exercise data: ExerciseDB, licensed to SetGrip. General information, not medical or coaching advice.