Single Arm Kettlebell Curl — how to, muscles worked, alternatives

How to do the Single Arm Kettlebell Curl

Stand tall, one kettlebell at your side, palm facing forward.
Keep your upper arm still and close to your side throughout the movement.
Curl the kettlebell up toward your shoulder, bending only at your elbow.
Lower slowly to full elbow extension, then switch arms.

Full technique — 7 steps

Stand tall with feet hip-width apart, holding one kettlebell by the handle at your side.
Turn your palm to face forward and let the arm hang straight.
Keep your upper arm close to your side and your torso upright.
Curl the kettlebell upward by bending the elbow without letting the elbow drift forward.
Raise until the forearm is nearly vertical and the biceps fully shorten.
Lower the kettlebell back to full elbow extension without swinging your torso.
Finish the set on one arm, then switch sides and repeat.

Common mistakes

Letting the elbow drift forward
Swinging the torso to start reps
Bending the wrist through the curl
Cutting off the bottom range

Form cues

Keep upper arm still
Palm stays up
Wrists stay straight
Start from full elbow extension

Compared with similar variants

	Single Arm Kettlebell Curl	Hammer Curl	Alternating Dumbbell Curl	Barbell Curl
Level	Beginner	Beginner	Beginner	Beginner
Technique to learn	easy	easy	easy	easy
How tiring	low	low	low	low
Wrist	moderate	low	low	low
Elbow	low	low	low	moderate
Equipment	Kettlebell	Dumbbells	Dumbbells	Barbell

An estimate from our exercise ratings, not medical advice. How we rate exercises

Substitutes by equipment

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

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 Beginner
This exercise Single Arm Kettlebell Curl Beginner
Harder Barbell Curl Beginner
Harder Bent Over Barbell Curl Intermediate

Too hard for now? Start with the Alternating Machine Biceps Curl.

Quick answers

What muscles does the Single Arm Kettlebell Curl work?

Primary: Biceps 9/10. Also works: Forearms 6/10, Front delts 3/10.

Which joints does the Single Arm Kettlebell Curl load?

Wrist: moderate, Elbow: low. Wrist — lighter options: Hammer Curl, Alternating Dumbbell Curl, Barbell Curl.

When should I do the Single Arm Kettlebell Curl in a workout?

Finisher. Goes last, once the heavy work is done. ≈ 8 min with rest.

How many sets and reps of the Single Arm Kettlebell Curl?

Strength: 3–4 sets of 6–8 reps, rest 1 min 30 s, 2 reps in reserve. Muscle growth: 3–4 sets of 10–15 reps, rest 1 min, 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 Single Arm Kettlebell Curl?

Dumbbells: Dumbbell Two-Hand Hammer Curl, Goblet Curl. Resistance bands: Incline Resistance Band Hammer Curl, Resistance Band Hammer Spider Curl. Barbell: Single Arm Barbell Curl, Landmine Concentration Curl. Machine: Ski Erg Biceps Curl.