Dumbbell 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 upright holding a dumbbell in each hand with arms fully extended at the sides and palms facing forward.
• Pin the upper arms against the sides of the torso and keep them stationary throughout the entire movement.
• Curl the dumbbells upward in a smooth arc, actively supinating the palms as the forearms approach vertical.
• Lower the dumbbells slowly under full control until the arms are nearly straight, fully stretching the biceps at the bottom.

Common mistakes

• Swinging the torso back to generate momentum, which shifts load away from the biceps.
• Allowing the elbows to drift forward during the curl, reducing the peak contraction.
• Dropping the weight during the descent instead of controlling the eccentric phase.

Frequently asked questions

Should I curl both arms at the same time or alternate?

Both work. Alternating curls let you focus on each side individually and may allow slightly more supination. Simultaneous curls are more time-efficient. Choose based on preference.

How do I know if I am using too much weight?

If you need to lean back or swing the elbows forward to complete a rep, the weight is too heavy. Reduce the load until you can complete all reps with the upper arms stationary.

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