The barbell curl is the classic bilateral biceps builder: both hands on a straight barbell, shoulder-width supinated grip, and a strict elbow-only curl up to shoulder height. It loads heavier than dumbbell variations and is the standard for biceps strength progression. Every serious arm program builds on it.
What it is
The barbell curl is a strict bilateral curl performed with a straight barbell held at shoulder-width with a supinated (palms-up) grip. The lifter curls the bar up by flexing the elbows only, keeping the upper arms locked to the sides. It is the heaviest biceps loading option in any gym and the gold standard for biceps strength.
Muscles worked
| Muscle | Contribution |
|---|---|
| Biceps brachii | ~70 % |
| Brachialis | ~15 % |
| Brachioradialis, forearms | ~10 % |
| Core (stabilisation) | ~5 % |
How to barbell curl: 5 steps
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Stand tall
Feet hip-width, **bar in hand at shoulder-width supinated grip.** Arms extended at hips.
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Brace and lock elbows
**Elbows pinned to the sides, core tight, shoulders back.**
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Curl up
**Curl the bar up by flexing the elbows only.** Upper arms stay locked.
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Peak contraction
**Pause at the top with maximal biceps squeeze** — bar at shoulder height.
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Controlled descent
**Lower over 2-3 seconds** to full arm extension. No bouncing at the bottom.
How it differs from dumbbell curl
- Bilateral fixed grip. Both hands on one bar — no independent loading like dumbbells.
- Heavier loading possible. Most lifters can barbell curl 15-25 % more than two dumbbells combined.
- Fixed supination. Grip stays supinated throughout — no rotation.
- Wrist demand. Straight bar fixes the wrist angle, which can strain some lifters (EZ-bar fixes this).
Common mistakes
When to use this variation
Use barbell curls as the main biceps strength builder once you have learned strict dumbbell curls. Program 3-4 sets of 6-10 reps for strength and hypertrophy. Pair after compound pulling like rows or chin-ups, or as the first arm exercise in a dedicated arms session.
FAQ
Straight bar or EZ-bar?
Straight bar maximises biceps engagement via full supination. The EZ-bar curl is gentler on the wrists. Use the bar your wrists tolerate; both build the same muscle.
What grip width?
Shoulder-width is the default. Wider hits the inner biceps, narrower hits the outer (long head). Vary occasionally.
How much weight?
For a 75 kg intermediate male: 30-45 kg for clean 8-10 rep sets. Advanced: 50-70 kg. Anything beyond rarely allows strict form.
Related exercises
- Dumbbell Curl: unilateral variant
- EZ-Bar Curl: wrist-friendly variant
- Preacher Curl: isolated bench-based curl
- Hammer Curl: neutral-grip variant
