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Dumbbell Alternate Biceps Curl animation

How to do the Dumbbell Alternate Biceps Curl

BicepsDumbbellIntermediate

The dumbbell alternate biceps curl is a foundational yet powerful movement that lets you dedicate full neural focus to each arm independently, exposing and correcting strength imbalances that bilateral curls can mask. Master it with strict mechanics and you build dense, functional biceps that carry over to every pulling movement you train.

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Muscles worked

Primary
Biceps
Secondary
BrachialisForearms

Step-by-step

  1. Stand tall with a dumbbell in each hand, arms fully extended, palms facing your thighs in a neutral grip before initiating the curl.
  2. Curl one dumbbell upward while supinating your forearm so your palm faces your shoulder at the top, keeping your elbow pinned at your side throughout.
  3. Squeeze the biceps hard at peak contraction for a brief pause, then lower the dumbbell under control back to full extension before switching arms.
  4. Maintain a strict alternating rhythm, ensuring the working arm completes its full range of motion before the opposite arm begins its rep.

Common mistakes

  • Swinging the torso to generate momentum — brace your core and pin your elbow to your side so the biceps do all the lifting, not your lower back.
  • Cutting the range of motion short at the bottom — fully extend the arm on every rep to maximize the stretch stimulus and total muscle tension over the set.
  • Forgetting to supinate — if your palm never rotates fully as you curl, you leave peak biceps activation on the table, so consciously twist your pinky upward as the dumbbell rises.

Pro tip — At the top of each rep, push your elbow slightly forward beyond vertical — this additional anterior shoulder flexion recruits the short head of the biceps more fully and intensifies the peak contraction far beyond what a standard curl achieves.

Sets & reps by goal

Build muscle3–4 sets × 10–15 reps
Get stronger3–4 sets × 6–8 reps
Lose fat / tone3 sets × 12–20 reps

Rest: 60–90 sec between sets.

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