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Single Hand Biceps Curl

The single-hand biceps curl trains one arm at a time with a dumbbell, finishing all reps on one side before switching. Removing the second dumbbell sharpens focus, exposes left-right strength gaps, and stops the stronger arm setting a pace the weaker one cannot honestly match. Coached by Maddy (NASM-CPT) — these are the exact form cues he gives on every client's first week.

Muscles worked

Biceps · biceps brachii Brachialis Forearms · brachioradialis Forearm flexors

Sets & reps by goal

Goal	Sets × Reps	Rest
Strength	4 × 3–6 per arm	2–3 min
Muscle	3–4 × 9–12 per arm	60–90 s
Endurance	3 × 18–27 per arm	45–60 s

Rep ranges per Helms 2014 · Schoenfeld 2016.

Level — Beginner

Beginner exercise — the single-arm format is a focus tool, not an added skill demand.

Proper form — 5 cues

Stand tall, dumbbell in one hand, palm facing forward
Pin the working elbow against your ribs
Curl the dumbbell to shoulder height without the elbow drifting forward
Squeeze the biceps hard at the top for one second
Lower on a three-count until the arm is fully straight

Breathing: Exhale curling up, inhale on the slow three-count down.

The 3 mistakes Maddy corrects most

Leaning back as the weight rises. The lean recruits the hips and lower back to start the curl, so the biceps never handles the sticking point that builds it. Fix: Brace the trunk, soften the knees, and choose a dumbbell the arm can move without the body's help.

Elbow sliding forward at the top. When the elbow travels, the front delt takes over the finish and the peak squeeze belongs to the shoulder, not the biceps. Fix: Imagine the elbow bolted to your side; the forearm is the only thing that swings.

Dropping the dumbbell down instead of lowering it. The lowering half of a curl drives a large share of growth — releasing it throws away half the exercise. Fix: Fight the descent for a full three seconds and end the set when that count can no longer be kept.

Common questions

Is curling one arm at a time better than both together?

It has real advantages: total concentration on one biceps, no chance of the stronger arm masking the weaker, and slightly more available strength per arm because the nervous system focuses on a single limb. The cost is time — sets take twice as long — so many lifters rotate between both styles.

One arm is clearly stronger — how do I fix the imbalance?

Start every exercise with the weaker arm, let its clean rep count set the target, and give the stronger arm exactly that number — nothing more. Add an optional extra set for the weak side twice a week. Most visible gaps close over a couple of months of this simple discipline.

What weight should I start single-arm curls with?

Choose a dumbbell you can curl ten to twelve times with the elbow pinned and torso still — commonly 4 to 8 kg for beginners, more with training history. If the last reps need a lean or a swing, the weight is ahead of your biceps; drop down and own the movement first.

Related exercises

Alternate Biceps CurlsBiceps Alternate Hammer CurlForearms · Biceps Biceps CurlsBiceps Hammer CurlForearms · Biceps Single Hand Biceps CurlsBiceps

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