Exercise guide
Barbell Curl
- Beginner
- Isolation
- Rep-based
- Upper arms
The barbell curl is a foundational isolation exercise for building bicep mass and strength by allowing for heavy loading and maximum tension through the elbow flexors.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Setup
- Stand upright with your feet shoulder-width apart and a slight bend in your knees for stability.
- Grip the barbell with an underhand (supinated) grip, with your hands positioned at shoulder-width.
- Pull your shoulder blades back and down, keeping your chest tall and elbows tucked firmly into your ribcage.
How to do it
- Exhale as you curl the bar toward your shoulders by flexing at the elbows, ensuring your upper arms remain completely stationary.
- Squeeze your biceps hard at the top of the movement for a one-second pause to maximize peak contraction.
- Inhale as you slowly lower the barbell back to the starting position using a controlled 2-3 second tempo until your arms are fully extended.
Form checklist
- Keep your elbows pinned to your sides; do not let them drift forward or flare out.
- Avoid using momentum or swinging your torso to 'cheat' the weight up.
- Maintain a neutral wrist position to avoid excessive strain on the forearms.
- Keep your core and glutes engaged to prevent your lower back from arching during the lift.
Pro tips
- Focus on driving your pinky fingers toward the ceiling as you curl to intensify the contraction in the bicep peak.
- Imagine your elbows are bolted to your ribs to ensure the biceps are doing all the work rather than the front deltoids.
Make it harder
- Perform '21s': 7 reps from the bottom to the midpoint, 7 reps from the midpoint to the top, and 7 full range-of-motion reps.
- Incorporate a 4-second eccentric (lowering) phase to significantly increase time under tension.
Frequently asked
- What muscles does the barbell curl work?
- The barbell curl primarily targets the biceps.
- What equipment do you need for the barbell curl?
- The barbell curl uses barbell.
- Is the barbell curl good for beginners?
- Yes. The barbell curl is a beginner-friendly movement and a strong foundation to build on.