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Dumbbell · Biceps

Bicep Curl Form: Stop Swinging the Weight

The dumbbell curl is easy to do badly — using your back and shoulders to sling the weight up. Here is how to isolate the biceps and actually make the exercise work.

· 2 min read

Bicep Curl demonstration

The bicep curl is a small, simple movement, which is exactly why momentum sneaks in so easily. The moment your torso starts swaying to help the weight up, your biceps stop being the limiting factor.

How to do it

  1. 1Stand tall — feet shoulder-width, dumbbells at your sides, palms facing forward.
  2. 2Pin your elbows — keep your upper arms glued to your sides through the whole rep.
  3. 3Curl without swinging — bend at the elbow only, bringing the dumbbell toward your shoulder without rocking your torso.
  4. 4Squeeze at the top — pause briefly at full contraction before lowering.
  5. 5Lower slowly — take 2–3 seconds to lower the weight — the lowering half of the rep builds as much strength as the lift.

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Sets and reps

3 sets of 8–12 reps per arm, choosing a weight where the last 2 reps are genuinely hard without your form breaking down.

Common mistakes

  • Swinging the torso. If you're rocking backward and forward to move the weight, it's too heavy — drop the load and keep your elbows pinned.
  • Elbows drifting forward. Letting your elbows travel forward turns a bicep curl into a front raise. Keep them at your sides.
  • Dropping the weight fast. Letting gravity do the lowering skips half the exercise's value. Control the descent.

Safety note

Wrist pain usually means the grip or wrist angle is off — keep the wrist neutral rather than bent back under load.

Slow, controlled and elbow-pinned beats fast and heavy every time for this one. The biceps respond to tension, not momentum.

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