Curl

Which muscles does it train?

Equipment needed

How to perform it

Isolation work is usually trained in a higher rep range: 2 to 4 sets of 10 to 15 reps with 45 to 90 seconds of rest, performed under control.

Execution and technique cues

• Stand tall holding the barbell with a shoulder-width supinated grip in front of the thighs and pin the elbows firmly against the sides of the torso.
• Keep the wrists neutral or slightly extended and avoid letting them flex or collapse toward you during the curl.
• Curl the bar upward by contracting the biceps until the forearms are nearly vertical, without allowing the elbows to drift forward.
• Lower the bar in a controlled manner until the arms are almost fully extended, using the complete range of motion on every rep.

Common mistakes

• Swinging the elbows forward at the top to reduce the biceps load and lift more weight than is appropriate.
• Using trunk swing or back extension as momentum to heave the bar up, which shifts work away from the biceps.
• Not lowering the bar fully at the end of each rep, cutting short the bottom portion of the range of motion and reducing the hypertrophic stimulus.

Frequently asked questions

Should I use a shoulder-width or narrower grip for the barbell curl?

A shoulder-width supinated grip is the standard starting point and distributes load evenly across the biceps. A narrower grip tends to emphasize the long head, while a wider grip places slightly more emphasis on the short head. Start shoulder-width and adjust based on feel.

How heavy should I go on the barbell curl?

Choose a weight you can move through the full range of motion without swinging or recruiting the lower back. For hypertrophy, 8 to 15 clean reps per set is a practical target range.

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