Single Hand Biceps Curls
Single-hand biceps curls alternate arms rep by rep — one dumbbell curls while the other arm rests at your side, trading places in a steady rhythm. The built-in micro-rest lets each biceps recover a beat between efforts, so you can hold crisp form deeper into the set than curling both arms together. Coached by Maddy (NASM-CPT) — these are the exact form cues he gives on every client's first week.
Muscles worked
Sets & reps by goal
| Goal | Sets × Reps | Rest |
|---|---|---|
| Strength | 4 × 3–6 per arm, alternating | 2–3 min |
| Muscle | 3–4 × 9–12 per arm, alternating | 60–90 s |
| Endurance | 3 × 18–27 per arm, alternating | 45–60 s |
Rep ranges per Helms 2014 · Schoenfeld 2016.
Level — Beginner
Beginner-friendly — the alternating rhythm builds in recovery, making it the most forgiving curl format.
Proper form — 5 cues
- Hold one dumbbell, or one in each hand with only one moving at a time
- Curl the working arm while the resting arm hangs completely still
- Rotate the palm up as the dumbbell passes your thigh
- Alternate arms in an even left-right rhythm — no double reps on one side
- Keep both shoulders level; do not dip toward the curling arm
Breathing: Exhale as each dumbbell curls up, inhale as it lowers — one full breath per arm.
The 3 mistakes Maddy corrects most
How to program single hand biceps curls
| Goal | Sets | Reps | Tempo | Rest | RPE |
|---|---|---|---|---|---|
| Strength — entry | 3 | 5-6 per arm, alternating | 2-0-1-0 | 2 min | 7 |
| Strength — standard | 4 | 3-6 per arm, alternating | 2-0-X-0 | 2-3 min | 8 |
| Strength — advanced | 4 | 3-5 per arm, alternating, heavy and strict | 3-0-X-0 | 2-3 min | 8-9 |
| Hypertrophy — entry | 3 | 9-10 per arm, alternating | 2-0-1-0 | 60-90 s | 7 |
| Hypertrophy — standard | 3-4 | 9-12 per arm, alternating | 2-0-1-1 | 60-90 s | 8 |
| Hypertrophy — advanced | 4 | 12 per arm, alternating, 3 s lowering | 3-0-1-1 | 90 s | 8-9 |
| Endurance — entry | 3 | 14-18 per arm, alternating | smooth, continuous | 60 s | 6-7 |
| Endurance — standard | 3 | 18-27 per arm, alternating | smooth, continuous | 45-60 s | 7-8 |
| Endurance — advanced | 3 | 27 per arm, brisk left-right rhythm | steady rhythm | 45 s | 8 |
| Beginner on-ramp — week 1-2 | 2 | 8-10 per arm, light dumbbells | 2-0-2-0 | 90 s | 5 |
| Beginner on-ramp — week 3-4 | 3 | 8-10 per arm, alternating | 2-0-1-0 | 60-90 s | 6 |
| Deload / technique | 2 | 8 per arm, light, alternating | 3-0-1-0 | 90 s | 5 |
Common questions
Alternating curls vs curling both arms at once — which builds more muscle?
Muscle growth follows the quality and quantity of hard sets, and both styles can deliver it. Alternating gives each arm a short rest every rep, so form survives longer and each rep gets full attention; simultaneous curls finish faster and load the trunk more. Pick by preference and rotate occasionally.
Why rotate my palm during the curl?
The biceps does two jobs — bending the elbow and turning the palm upward. Starting neutral at your side and rotating to palm-up as you curl lets the muscle perform both roles in one rep, which many lifters find gives a stronger contraction than keeping the wrist fixed throughout.
How many alternating curls make a good set?
Count per arm, not total swings. Nine to twelve quality reps per arm suits muscle-building; the alternating format means such a set takes a while, which is part of its value. Stop when the torso starts helping — extra swung reps train momentum, not biceps.
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