Arms · Isolation

Barbell Curl

The classic standing barbell curl for building bicep mass and strength with an underhand grip. Both arms working on one bar allows the heaviest loading of any curl, which makes it the biceps equivalent of a main lift and the version to progress hardest over time. Every other curl in the library is a variation on this pattern.

By Macros Inc Team Verified by Alex Dedmon Updated August 2026

Beginner Barbell Isolation Pull
barbell-curl-poster
  • Level Beginner
  • Equipment Barbell
  • Primary Muscles Biceps, Forearms
  • Movement Isolation Pull

Demonstration

Watch the Form Demo

Technique

How to Do the Barbell Curl

  1. Grip a barbell underhand at shoulder width and stand tall with the bar at your thighs.
  2. Pin your elbows to your sides and brace your torso.
  3. Curl the bar up toward your shoulders without swinging.
  4. Squeeze the biceps hard at the top for a beat.
  5. Lower over two to three seconds until your arms are fully straight.
  6. Reset your posture before each rep.

Anatomy

Muscles Worked

arms
Primary muscles
Biceps Forearms

Do This

Form Cues

  • Stand tall with the elbows pinned to your ribs.
  • Curl without letting the shoulders roll forward.
  • Lower to full extension every rep.
  • Squeeze the bar tight and lock the wrists straight. A soft grip leaks force out of every rep.

Avoid This

Common Mistakes

  • Swinging the torso to start each rep.
  • Letting the elbows travel forward so the front delts take over.
  • Stopping halfway down and losing the stretch.
  • Adding weight through body swing rather than bicep strength. If your hips start the rep, the load is wrong.

More to Explore

Variations & Related Exercises

Variations of this lift

Trains the same muscles

Put It Into Practice

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