Dumbbell Curl
The dumbbell curl is a simple arm exercise where you bend your elbows to lift a pair of dumbbells from hip height up towards your shoulders. It builds the biceps, with the forearms helping to hold the weights steady. It suits complete beginners and experienced lifters alike, as the weight is easy to adjust and each arm works on its own.
Muscles worked
The Dumbbell Curl mainly works your biceps, with your forearms helping.
Setting up
- Pick a pair of dumbbells you can lift for 10-12 controlled reps. Most beginners start with around 4-8 kg in each hand.
- Stand with your feet about hip-width apart and your knees soft, not locked. Wear flat, stable trainers.
- Let the dumbbells hang at your sides with your palms facing forward, and stand tall with your ribs stacked over your hips.
- Tuck your elbows lightly against your sides and keep a firm but comfortable grip, with your wrists in line with your forearms.
How to do the Dumbbell Curl
- Start with your arms almost fully straight, the dumbbells beside your thighs and your palms facing forward.
- Keeping your upper arms still and your elbows close to your sides, bend your elbows and start to raise the dumbbells.
- Curl the weights up in a smooth arc until your forearms are close to vertical and the dumbbells are near your shoulders.
- Pause briefly at the top and squeeze your biceps, the muscle on the front of your upper arm.
- Lower the dumbbells slowly, taking about three seconds, until your arms are almost straight again.
- Repeat for your reps, either lifting both arms together or alternating one arm at a time.
Form tips
- Imagine your elbows are fixed to your sides like hinges. Only your forearms should move.
- Keep your wrists straight and firm. Don't let the dumbbells tip your hands backwards or curl your wrists up.
- Take about two seconds to lift and three seconds to lower. The slow lowering phase is where a lot of the work happens.
- Stand tall and keep your torso still. If you have to lean back to get the weight up, it's too heavy.
- If you alternate arms, finish the lowering on one side before you start lifting the other, so each rep stays controlled.
Common mistakes
Swinging the weights up
Lower the weight and stand tall with your torso still. If you rock backwards or bounce the dumbbells off your hips, your biceps are not doing the work. Slow down, especially on the way up.
Elbows drifting forward
Keep your upper arms close to your sides and pointing straight down. If your elbows travel forward as you lift, you lose tension on the biceps. Think about keeping the elbows in the same spot throughout.
Dropping the weight on the way down
Lower for around three seconds instead of letting gravity do it. Control the dumbbells all the way to almost straight arms before you start the next rep.
Short, half reps
Use a lighter weight so you can lower until your arms are almost straight, then curl up until the dumbbells are near your shoulders. Full, controlled reps are better than heavy partial ones.
Sets and reps
| Build strength | 3-4 sets of 6-8 reps with a challenging weight and good form, resting 90-120 seconds between sets. |
|---|---|
| Build muscle | 3-4 sets of 8-12 reps, resting 60-90 seconds. Choose a weight where the last 2 reps are hard but your form stays tidy. |
| Fat loss and general fitness | 2-3 sets of 12-15 reps with a lighter weight, resting 45-60 seconds. Use it alongside full-body exercises and regular cardio as part of your overall plan. |
Pick a weight where the last rep or two of each set is hard but your form stays clean. When every set feels easy, it's time to go up.
Dumbbell Curl alternatives
Machine taken, or want some variety? These work the same main muscles.
Dumbbell Curl FAQs
How heavy should my dumbbells be for curls?
Choose a weight you can lift for 10-12 reps without swinging or leaning back, with the last couple of reps feeling hard. Many beginners start with 4-8 kg in each hand. If your form falls apart, go lighter and build up gradually.
Should I do dumbbell curls alternating or together?
Both work the biceps well. Alternating lets you focus on one arm at a time and often feels easier to control, while lifting both together is quicker. Choose whichever helps you keep good form, and feel free to mix them.
Why do I feel dumbbell curls in my forearms?
Your forearms work to grip the dumbbells and keep your wrists steady, so some effort there is normal. If they tire before your biceps, try a lighter weight, keep your wrists straight and avoid squeezing the handles too hard. Stop if you feel any pain and get it checked.
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