Muscles worked
What the barbell curl trains
Tap a muscle to see just that one and what it does in the lift.
Before the first rep
How to set up
- 01
Load the bar. Start lighter than you think: an empty bar or small plates is plenty for most people at first. Put collars on so the plates cannot slide.
- 02
Stand tall. Feet about hip width apart, knees soft, ribs down and glutes lightly squeezed, so your body stays still for the whole set.
- 03
Grip. Take an underhand grip with your hands about shoulder width, so your forearms hang straight down from your elbows. Wrap your thumbs around the bar and keep your wrists straight.
- 04
Start position. Let the bar hang at arm's length against the front of your thighs, elbows close to your ribs and shoulders back and down, not shrugged.
Step by step
How to do the barbell curl
- 01
Brace. Take a breath and tighten your trunk. Your elbows stay by your sides from here on.
- 02
Curl. Bend your elbows and bring the bar up in an arc toward your shoulders, moving only your forearms. Keep your wrists straight and your chest up.
- 03
Top of the rep. Stop when the bar is near the front of your shoulders and your elbows are fully bent, with your elbows still by your sides. Squeeze your biceps for a moment.
- 04
Lower slowly. Take about two to three seconds to lower the bar along the same arc, keeping your body still.
- 05
Straight arms. Finish each rep with your elbows fully straight and the bar back at your thighs, without letting it drop or your shoulders roll forward.
Cues to say in your head
- Elbows pinned to your ribs
- Chest up, no swing
- Wrists straight
- Squeeze at the top
- Slow on the way down
- Straight arms every rep
Fix these first
Common mistakes
Leaning back to heave the bar up
Lower the weight until you can curl it with your torso still. If your hips have to push forward or your back has to lean to finish a rep, the set is over.
Elbows drifting forward as the bar rises
Keep your elbows by your sides. When they swing forward, the front of your shoulder takes over and the biceps do less.
Stopping short of straight arms
Lower all the way to straight elbows every rep. Half reps let you use more weight but skip the hardest part of the range.
Dropping the bar on the way down
Control the lowering for two to three seconds. Letting the bar fall snaps your elbows straight and wastes half the rep.
Wrists bending back or curling in
Keep your wrists straight, in line with your forearms. If a straight bar strains your wrists, switch to an EZ bar.
Grip too narrow or too wide
Start with your hands about shoulder width. Very narrow or very wide grips tend to bother the wrists and elbows on a straight bar.
Stay safe
The normal way to end a set is simply to lower the bar under control to your thighs: you do not need a rack or spotter, but do not lean back or bounce to grind out a last rep. Lower to straight arms smoothly instead of letting the bar snap your elbows into lockout. If a straight bar hurts your wrists or elbows, use an EZ bar or dumbbells. Stop if you feel sharp pain in the front of your elbow or shoulder, and if you feel a pop with sudden pain or bruising, stop training the arm and see a doctor or physical therapist.
Programming
Sets, reps and how much weight
| Goal | Sets | Reps | Load | Rest |
|---|---|---|---|---|
| Muscle | 3 to 4 | 8 to 12 | 65–80% 1RM | 1 to 2 min |
| Endurance | 2 to 3 | 15 to 20 | 50–65% 1RM | 45 to 90 sec |
| Technique | 2 to 3 | 10 to 12 | 50–60% 1RM | 1 min |
Plan your next session
Put in a recent set. You get working weights for your goal, a warm-up and the plates to load.
Estimated 1RM 216 lb
Endurance sets
110–140lb
2 to 3 sets of 15 to 20 reps, 45 to 90 sec rest. Lighter weight and a steady tempo. Good as a finisher or on a lighter week.
Warm up to 125 lb
Tap a set to see its plates.
35 + 5
Estimates use the Epley formula and work best from sets of 3 to 8 reps. Treat them as a starting point and adjust by how the first working set moves.
Questions
Barbell Curl questions
What muscles does the barbell curl work?
Mainly the biceps, with the brachialis underneath them and the brachioradialis in the forearm helping bend the elbow. Your grip, shoulders and trunk work to hold everything still.
Is the EZ bar curl better than the barbell curl?
Neither is better for growth; both train the same muscles. The straight bar locks your palms fully up, while the EZ bar's angled grip is usually easier on the wrists and elbows, so pick the one that feels better on your joints.
Barbell curl vs dumbbell curl: which is better?
Both build the biceps well. The barbell lets you lift more total weight and add it in small steps, while dumbbells train each arm alone and let your wrists turn freely. Many programs use one as the main curl and the other for variety.
How many sets and reps of barbell curls should I do?
For muscle growth, 3 to 4 sets of 8 to 12 reps taken close to failure works well for most people, two or three times a week. Add reps first, then add weight once you reach the top of the range.
How wide should my grip be on a barbell curl?
Start with your hands about shoulder width, so your forearms hang straight down. A slightly wider or narrower grip is fine if it feels better on your wrists and elbows.
Is it OK to swing or cheat on barbell curls?
For most sets, no: keep your torso still so the biceps do the work. A little body English on the last rep is something experienced lifters sometimes use on purpose, but if you need it on every rep, the weight is too heavy.
Train in Protocol
Log your barbell curl by voice. Protocol tracks the rest.
Your last session shows up before every set, warm-ups and plates are worked out for you, and your coach sees every lift next to your sleep and recovery.