Strength form guide
How to Do a Bicep Curl: Form, Weight Choice and Variations for Beginners
A step-by-step guide to the dumbbell bicep curl, with cues that stop the swing, a simple way to pick your starting weight, hammer and alternating variations and a 4-week plan.
TL;DR
- Stand tall, keep your upper arms still by your sides, curl the dumbbells up towards your shoulders and lower them slowly until your arms are straight.
- Pick a weight you can lift 8 to 12 times with clean form. If you have to swing, lean back or let your elbows drift forwards, it is too heavy.
- Hammer curls (palms facing each other) bring in more of your forearm and the muscle under your biceps.
- Alternating curls, one arm at a time, help you focus on each side.
- Two or three sets of 8 to 12 reps, once or twice a week at the end of a strength session, is plenty for most beginners.
8 to 12
reps per set, the loading range the American College of Sports Medicine suggests for beginners
2 to 10%
load increase it suggests once you beat your target reps by one or two
2
days a week of muscle-strengthening activity in NHS guidance for adults
To do a bicep curl, stand tall with a dumbbell in each hand, palms facing forwards, and bend your elbows to lift the weights towards your shoulders while your upper arms stay still by your sides. Then lower the weights slowly until your arms are straight again, without swinging your body or letting your elbows drift forwards. The two things that decide whether it works are the weight you choose and how still you keep everything apart from your forearms. Below you will find step-by-step cues, a simple way to pick your starting weight, the hammer and alternating variations, the classic mistakes and a 4-week plan.
What muscles does a bicep curl work?
The main target is the biceps brachii, the muscle on the front of your upper arm. It has two heads, a long head and a short head, and it does two jobs: it bends your elbow and it turns your palm to face up. With your elbow bent, it is the strongest muscle for turning your palm up, a movement called supination. That is why the classic curl is done with your palms facing forwards and up.
Two other muscles help. The brachialis sits underneath the biceps and bends the elbow whichever way your palm faces. The brachioradialis runs from the outside of your elbow down your forearm and works hardest when your thumb points up, which is the hammer curl position.
Curls are a single-joint exercise, best treated as an add-on to bigger moves. Your biceps already help with pulling exercises such as rows and the lat pulldown, and curls give them focused extra work.
How do you do a dumbbell bicep curl step by step?
- Set up. Stand with your feet about hip-width apart and knees soft, a dumbbell in each hand, arms hanging by your sides and palms facing forwards.
- Brace. Stand tall, ribs down, and gently tighten your stomach as if you are about to be nudged. Draw your shoulders back and down, away from your ears.
- Pin your elbows. Keep your elbows close to your sides, just in front of your hips. They are the hinge, and they should stay in roughly the same spot for the whole set.
- Curl up. Bend your elbows to lift the dumbbells towards your shoulders. Keep your wrists straight, not curled in or bent back.
- Squeeze at the top. Stop when your forearms are close to vertical and you feel your biceps working hard. Pause for a moment without letting your elbows travel forwards.
- Lower slowly. Take two to three seconds to lower the weights until your arms are straight, without locking out hard. Then go again.
Breathe out as you lift and in as you lower. Not sure if your elbows are moving? Try a set side-on to a mirror.
How heavy should your first bicep curl weights be?
Lighter than your ego wants. The American College of Sports Medicine suggests beginners use loads they can lift for 8 to 12 reps, so do a test set: pick a dumbbell you think is manageable and do as many clean reps as you can, stopping when your form slips.
| Clean reps you managed | What it means | What to do next |
|---|---|---|
| Fewer than 8 | Too heavy for now | Drop to a lighter pair and test again |
| 8 to 12, last two hard | About right | Use this weight for your sets |
| More than 15 with ease | Too light | Move up one dumbbell size |
As a rough guide, many beginners land somewhere around 4kg to 6kg per hand, and some people need less. At home, full water bottles or a resistance band are enough to learn the movement.
To progress, the same position stand suggests adding 2 to 10% to the load once you can do one or two reps more than your target. With small dumbbells, though, the next size up is often a much bigger jump than that, so add reps first. Work up to 12 clean reps on every set, then move up a size and start again at 8.
What are the most common bicep curl mistakes?
Almost every curl mistake comes from the same place: the weight is too heavy, so the body finds another way to move it.
| Common mistake | What it looks like | The fix |
|---|---|---|
| Swinging | Leaning back or rocking from the hips to throw the weight up | Go lighter, brace your stomach, or try a set with your back against a wall |
| Elbows drifting forwards | Elbows travel up and in front of you as you lift, so your shoulders take over | Keep elbows by your sides and stop the rep when they want to move |
| Elbows flaring out | Elbows wing out to the sides | Turn your elbow creases to face forwards and keep the arms close to your body |
| Half reps | Stopping well short of straight arms at the bottom | Lower all the way down on every rep, and drop the weight if you cannot |
| Dropping the weight | Letting gravity do the lowering in under a second | Count two to three seconds on the way down |
Swinging and drifting elbows are the two to watch most closely. If every rep needs a hip thrust to get started, the weight is doing the training, not your arms.
How do you do a hammer curl?
A hammer curl is the same movement with your palms facing each other, thumbs pointing up, as if you are holding two hammers. Keep your elbows by your sides, curl the dumbbells up towards your shoulders without twisting your wrists, then lower slowly.
Because your thumbs point up, the brachioradialis and the brachialis do more of the work, so you will often feel it along the top of your forearm too. Many people find this grip comfortable on the wrists, and it mirrors how you carry shopping bags. A simple approach is to include both: standard curls one day, hammer curls the next.
How do you do an alternating bicep curl?
Instead of lifting both dumbbells together, you curl one arm at a time. Lift the right dumbbell, lower it fully, then lift the left. One rep on each arm counts as one rep, so a set of 10 means 10 per side.
Alternating curls make it easier to give each arm your full attention, and you can spot if one side is weaker or tends to cheat. The catch is that it is easy to rock side to side, so keep your hips square and your body still.
What do the regressions and progressions look like?
Start at whichever rung lets you do 8 to 12 controlled reps, and only move up when it feels easy to keep your elbows still.
- Band curl. Stand on a resistance band and curl the handles up. Ideal at home.
- Seated dumbbell curl. Sitting on a bench or firm chair makes it much harder to swing.
- Standing dumbbell curl. The standard version, with both arms together or alternating.
- Barbell or EZ-bar curl. One bar for both arms, which often lets you add weight in smaller steps.
- Slow lowering curls. Take four seconds to lower each rep. Same weight, much harder work.
How many sets and reps of bicep curls should beginners do?
Two or three sets of 8 to 12 reps, with about 60 to 90 seconds of rest, once or twice a week, is plenty. Put curls near the end of your session. The same position stand recommends multiple-joint exercises such as squats, rows and presses before single-joint ones like curls. This simple 4-week plan builds the habit.
| Week | Version | Sets and reps | Focus |
|---|---|---|---|
| 1 | Seated dumbbell curl | 2 x 10 | Learn the path, elbows still |
| 2 | Standing dumbbell curl | 2 x 12 | Two to three seconds on the way down |
| 3 | Standing curl plus hammer curl | 2 x 10 of each | Keep the body still on both |
| 4 | Alternating curl | 3 x 10 per arm | If all sets hit 12 easily, move up a size |
For a ready-made session to slot these into, try our beginner full-body dumbbell workout, finished with two sets of curls.
Do bicep curls help runners and hybrid training?
Honestly, curls will not make you run faster. What they do offer is extra arm strength for everyday lifting and carrying, a little more support for the pulling exercises in your plan, and a quick finisher that will not leave your legs tired for tomorrow's run. A simple hybrid week might look like this: an easy run Monday, full-body strength finished with two sets of curls on Tuesday, intervals or HIIT on Thursday, upper-body strength finished with hammer curls on Friday, and a longer run at the weekend.
New to the gym? Read how to start strength training as a beginner first. Curls are a nice extra, but squats, hinges, presses and rows matter more.
How can Edge help you build arm strength?
Edge is a free fitness app. Edge Pro, from £19.99 a month with a free 7-day trial (you need a card to start it), gives you a fully personalised plan across running, strength, HIIT and mobility, ready within 24 hours, with a real coach to message anytime. Edge treats running, strength and HIIT as one plan, so your arm work, strength sessions and runs sit together in one week. Not sure which weight to pick, or when to move up a size? Ask your coach. From November 2026, Edge Rewards will also turn any logged workout into points. 20,000+ members already train with Edge.
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This article is general guidance, not medical advice. If you are new to exercise, returning from injury, or managing a health condition, speak to your GP before starting, and see a physio for any niggle that does not settle.
