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Seated Dumbbell Biceps Curl

Sitting upright on a bench, you curl a dumbbell in each hand with palms turning up, the seat quietly deleting the leg-drive and lean-back that pollute standing curls. It is a foundational arm builder that also serves as an honesty check: the seated version tells you what your standing curl weight really is. Coached by Maddy (NASM-CPT) — these are the exact form cues he gives on every client's first week.

Muscles worked

Biceps · biceps brachii Brachialis Forearms · brachioradialis Forearm flexors

Sets & reps by goal

GoalSets × RepsRest
Strength4 sets x 3-6 reps2-3 min
Muscle3-4 sets x 9-12 reps60-90 sec
Endurance2-3 sets x 18-27 reps30-45 sec

Rep ranges per Helms 2014 · Schoenfeld 2016.

Level — Beginner

Beginner — expect the strict seated position to shave a little off your standing curl weight; that smaller number is the true one.

Proper form — 5 cues

  1. Sit tall on an upright or 90-degree bench with a dumbbell hanging at each side.
  2. Pin the elbows beside the ribs — they neither rise nor drift backward.
  3. Curl both dumbbells up, turning the palms to face the shoulders as they rise.
  4. Squeeze the biceps hard at the top for one full second.
  5. Lower over three seconds until the arms hang completely straight.

Breathing: Exhale as the dumbbells curl up, inhale through the slow lowering.

The 3 mistakes Maddy corrects most

Torso rocks back with each curl.. Even seated, the upper body can sway to throw the dumbbells past the sticking point, and every sway steals tension from the biceps. Fix: Set the bench back to vertical and keep your spine in light contact with it — the pad becomes a lie detector.
Reps end with arms half straight.. Skipping the bottom third avoids the stretched range where growth stimulus is strongest, and shortens the muscle's working excursion set after set. Fix: Straighten the elbows fully at the bottom of every rep — if full extension costs you two reps, those reps were not real.
Wrists curl inward to finish the lift.. Flicking the wrists adds forearm flexion that inflates the top of the rep while the biceps stop short of full contraction. Fix: Keep the wrists neutral like extensions of the forearm, and let the biceps alone carry the dumbbell to the top.

Common questions

Seated vs standing dumbbell curls — which is better?

The seated version is stricter: the bench removes leg drive and most torso sway, so the biceps face the load with less help. The standing version allows slightly heavier dumbbells and trains a touch of trunk stability. For pure arm growth, most lifters get more per set seated; standing curls remain fine when done as strictly as the seat would enforce.

Should I curl both arms together or alternate?

Both patterns work. Curling together halves the set duration and keeps the torso balanced, but invites a subtle backward lean as fatigue builds. Alternating lets each arm rest briefly and makes cheating easier to spot in the mirror, at the cost of longer sets. A practical rule: together for lighter, stricter sets; alternating when pushing heavier dumbbells.

Why turn the palms during the curl?

The biceps does two jobs — bending the elbow and rotating the palm upward — and the turning motion, called supination, engages the second job in the same rep. Starting neutral at the bottom and finishing palm-up at the top lets the muscle complete both functions under load, which is why the twist is built into the movement rather than decoration.

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