Concentration curl: how to perform it.
The concentration curl is the bicep exercise stripped down to its essence: seated, elbow braced against the thigh, zero room to cheat. No other curl removes as much momentum from the equation, which is exactly why light loads here produce contractions that standing curls can only dream of.
Starting position
- Sit on a bench, legs wide, one dumbbell on the floor between your feet.
- Elbow braced against the inner thigh, arm extended, shoulder relaxed above the dumbbell.
- Other hand on the opposite knee, stabilizing your torso.
Proper form
- Curl the dumbbell up toward your shoulder, rotating your wrist outward (supination) as you go.
- The elbow stays glued to the thigh: it's your fixed point, not a moving pivot.
- At the top, squeeze the bicep hard for a full second, without pulling your shoulder toward the dumbbell.
- Lower over 3 seconds until the arm is nearly straight.
- At the bottom, don't rest the dumbbell against your leg: tension stays on between reps.
When to inhale, when to exhale
Exhale on the way up, inhale on the way down. The slow tempo is the whole point of this exercise.
Mistakes to avoid
If the elbow lifts off or slides along the thigh, your torso is rowing instead of your bicep curling. Plant it and forget about it: only the forearm moves.
Leaning forward halfway through the rep shortens the range of motion and masks a load that's too heavy. Your chest stays right where it started.
Curling up with a fixed grip leaves the bicep's second function on the table. Rotate your pinky toward your shoulder as you curl up: the peak contraction hits differently.
DAWT tip. Use this as your LAST bicep exercise, 2-3 sets of 10-12 per arm with a 3-second negative: after the heavy curls, this is the finishing work where millimeters matter more than kilos.
Variations and alternatives
Quick answers
What weight should you use for concentration curls?
A lot less than you'd think: typically 50-60% of what you use for standing curls. With no momentum available, 8 kg done right burns more than 14 done sloppy. The right load is one that lets you squeeze hard at the top on every single rep.
Does the concentration curl build a bicep "peak"?
Peak shape is mostly genetic, but full supination under load combined with peak contraction work trains the long head hard, and that's the head that contributes most to the peak. It's the right exercise for the job, just keep your expectations honest.
Related exercises
How much should you load on this exercise?
DAWT's AI coach tells you, set by set: it builds your plan around your goals, auto-regulates the load from your real effort and corrects you while you train. Download the app and start free.
