# Alternating Seated Dumbbell Curl

A seated biceps curl that works one arm at a time, alternating sides. Sitting on a bench removes leg drive and makes torso swing easy to notice.

- Beginner · Isolation
- Equipment: Dumbbells, Flat bench
- HD video: https://media.seto.fit/exercises/alternating-biceps-curl-seated-dumbbells/video/male.mp4
- HTML: https://seto.fit/exercises/alternating-seated-dumbbell-curl/

## Muscles worked

- Biceps: 10/10
- Forearms: 5/10
- Front delts: 2/10

## How to do the Alternating Seated Dumbbell Curl

1. Sit on a bench, holding a dumbbell in each hand, palms facing forward.
2. Curl one dumbbell up toward your shoulder, keeping your elbow still.
3. Slowly lower the weight to full elbow extension, then repeat on the other side.

### Full technique — 7 steps

1. Sit upright on the end of a flat bench with feet flat on the floor and a dumbbell in each hand.
2. Let your arms hang at your sides with palms facing forward and elbows close to your torso.
3. Curl one dumbbell toward the same-side shoulder without letting the elbow drift forward.
4. Raise until the forearm is nearly vertical and the biceps fully shorten.
5. Lower that dumbbell back to full elbow extension without swinging your torso.
6. Curl the opposite dumbbell the same way while the first arm stays at your side.
7. Continue alternating sides, keeping each rep smooth and matching the range on both arms.

## Common mistakes

- Leaning back to start reps
- Letting the elbow drift forward
- Turning it into a hammer curl
- Cutting off the bottom range
- Swinging the torso to start reps

## Form cues

- Keep upper arm still
- Palm stays up
- Sit tall on bench
- Match both sides
- Reach full elbow extension

## How much to do

- **Strength**: 3–4 sets of 6–8 reps · rest 1 min 45 s · 2 reps in reserve · lower 3 s, lift 1 s
- **Muscle growth** (best fit): 3–4 sets of 8–12 reps · rest 1 min 15 s · 2–3 reps in reserve · lower 2 s, lift 2 s
- **Endurance** (good fit): 2–3 sets of 15–20 reps · rest 45 s · 3–4 reps in reserve · lower 2 s, lift 2 s

Reps in reserve: how many more you could still do when you end the set.

## Substitutes by equipment

Same muscles, same movement — pick the version you have the gear for.

- **Resistance bands**: [Squatting Resistance Band Curl](https://seto.fit/exercises/squatting-resistance-band-curl/), [Incline Resistance Band Curl](https://seto.fit/exercises/incline-resistance-band-curl/)
- **Barbell**: [Seated Barbell Curl](https://seto.fit/exercises/seated-barbell-curl/), [Single Arm Barbell Curl](https://seto.fit/exercises/single-arm-barbell-curl/)
- **Kettlebell**: [Kettlebell Goblet Curl](https://seto.fit/exercises/kettlebell-goblet-curl/), [Single Arm Kettlebell Curl](https://seto.fit/exercises/single-arm-kettlebell-curl/)
- **Cable machine**: [Single-Arm Cable Cross-Body Curl](https://seto.fit/exercises/cable-curl-behind-back/), [Single Arm Cable Curl](https://seto.fit/exercises/cable-bicep-curl-single-arm/)

## Where to start and where to go next

Same muscles, same movement. Too hard for now — step down; once it gets easy — step up.

- Easier: [Alternating Machine Biceps Curl](https://seto.fit/exercises/alternating-machine-biceps-curl/) — Beginner
- **This exercise: Alternating Seated Dumbbell Curl — Beginner**
- Harder: [Seated Zottman Curl](https://seto.fit/exercises/seated-zottman-curl/) — Beginner
- Harder: [Single Arm Dumbbell Zottman Preacher Curl](https://seto.fit/exercises/single-arm-dumbbell-zottman-preacher-curl/) — Intermediate

## Quick answers

### What muscles does the Alternating Seated Dumbbell Curl work?

Primary: Biceps 10/10. Also works: Forearms 5/10, Front delts 2/10.

### Which joints does the Alternating Seated Dumbbell Curl load?

Elbow: low, Wrist: low.

### When should I do the Alternating Seated Dumbbell Curl in a workout?

Finisher. Goes last, once the heavy work is done. ≈ 6 min with rest.

### How many sets and reps of the Alternating Seated Dumbbell Curl?

Strength: 3–4 sets of 6–8 reps, rest 1 min 45 s, 2 reps in reserve. Muscle growth: 3–4 sets of 8–12 reps, rest 1 min 15 s, 2–3 reps in reserve. Endurance: 2–3 sets of 15–20 reps, rest 45 s, 3–4 reps in reserve.

### What can I do instead of the Alternating Seated Dumbbell Curl?

Resistance bands: Squatting Resistance Band Curl, Incline Resistance Band Curl. Barbell: Seated Barbell Curl, Single Arm Barbell Curl. Kettlebell: Kettlebell Goblet Curl, Single Arm Kettlebell Curl. Cable machine: Single-Arm Cable Cross-Body Curl, Single Arm Cable Curl.

### What is an easier version of the Alternating Seated Dumbbell Curl?

Alternating Machine Biceps Curl (Beginner).

### What is a harder version of the Alternating Seated Dumbbell Curl?

Seated Zottman Curl (Beginner), Single Arm Dumbbell Zottman Preacher Curl (Intermediate).

How we rate exercises: https://seto.fit/guides/methodology/

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