How to do the Barbell Curl
BicepsBarbellIntermediate
The barbell curl is one of the most time-tested tools for building thick, powerful biceps because it lets you load both arms simultaneously with a stable, heavy bar. Master the mechanics here and you will lay the foundation for sleeve-filling upper arm development that carries over to every pulling movement you do.
Add this to my personalized plan →Muscles worked
Primary
Biceps
Secondary
BrachialisForearms
Step-by-step
- Stand tall with a shoulder-width underhand grip on the bar, arms fully extended and elbows pinned against your sides.
- Initiate the movement by contracting the biceps, curling the bar in a controlled arc up toward your upper chest without letting your elbows drift forward.
- Squeeze the biceps hard at the top for a full one-second contraction before beginning the descent.
- Lower the bar slowly over two to three seconds back to full elbow extension, resisting gravity the entire way down.
Common mistakes
- Swinging the torso to heave the weight up — reduce the load and initiate every rep with the biceps alone, keeping your lower back neutral throughout.
- Letting the elbows slide forward at the top to gain extra range — keep elbows fixed at your sides so the biceps, not the front delts, finish the rep.
- Dropping the bar too fast on the way down — the eccentric phase builds as much muscle as the lift, so control the descent and never let gravity do the work.
Pro tip — At the very top of the curl, consciously pronate your pinkies slightly inward toward the bar's center before squeezing — this small adjustment maximally shortens the biceps and recruits the often-undertrained short head for a far more complete contraction.
Sets & reps by goal
Build muscle3–4 sets × 10–15 reps
Get stronger3–4 sets × 6–8 reps
Lose fat / tone3 sets × 12–20 reps
Rest: 60–90 sec between sets.
More Biceps exercises
Want this built into a full plan?2fit4u turns moves like this into your personalized weekly program — free to start.
Build my free plan →