Arm workout: count what the compounds already did

Your arms are two groups of muscle. The biceps, with the brachialis and brachioradialis beside it, bends the elbow; together they're called the elbow flexors. The triceps straightens the elbow, and one of its three heads, the long head, also crosses the shoulder. Every press you do straightens your elbows, and every row, pulldown and chin-up bends them.

So an arm workout doesn't start with a list of curls. It starts with a count of the arm work your week already holds, then adds direct work where it does something the compound lifts don't. The presses and pulls come from the chest workout and the back workout; this page is what goes after them.

Start with the count

A 2026 meta-regression of 67 studies sorted every set as direct or indirect for the muscle being measured. The counting method with the strongest support scored an indirect set as half a set, and the authors call the direct-or-indirect distinction essential for predicting what a program will do.¹ For the arms, the count reads like this:

On that count, ten hard sets of presses a week come to about five for the triceps, and the twelve sets of pulling in the back workout's two sessions come to about six for the biceps, before a single curl. On progressive overload's numbers, a beginner lands around 6 to 10 hard sets per muscle each week, so a new lifter's arms may be most of the way there already. The 2026 position stand from the American College of Sports Medicine linked ten or more weekly sets per muscle group with more growth;² reaching ten for the arms usually takes a few direct sets.

The half-set rule was fitted across many muscles, not the arms alone. Read it as a way to count, not as a measurement of your biceps.

Do the compound lifts grow your arms on their own?

Several trials have tested it, all of them in men. In four, the compounds did much of the job:

• Arm exercises added on top. 29 untrained young men did the bench press and the lat pulldown for ten weeks, half of them with curls and triceps extensions added. Elbow flexor thickness rose 6.5% without the extra exercises and 7.04% with them, and strength rose in both, with no difference between the groups.³ In 20 men with at least two years of lifting, eight weeks with or without single-joint exercises changed arm circumference and arm strength about equally.⁴
• Pulldowns or curls. In another ten-week trial of 29 untrained young men, one group trained the elbow flexors only with lat pulldowns and the other only with biceps curls. Muscle thickness rose 6.10% and 5.83%, and the authors found the two equally effective.⁵
• The bench press alone. 13 healthy men who did nothing but bench press for ten weeks grew their triceps more than a control group that didn't train, though less than their chest.⁶

Two found a gap:

• A row against a curl. 10 untrained men trained one arm with one-arm dumbbell rows and the other with curls for eight weeks. The curl arm's elbow flexors grew 11.06%, the row arm's 5.16%.⁷
• The bench against a triceps exercise. 43 young men trained with the bench press, a lying barbell triceps press, or both in either order. The triceps grew significantly in every group that did the triceps press, but not in the bench-only group, though the groups didn't differ significantly from each other. The long head grew more with the triceps press; the lateral head grew more with the bench.⁸

Read together: presses and pulls already train the arms, and in two trials adding arm exercises on top added little. The trials split on whether a pull matches a curl for the biceps, equal in one and about half the growth in the other. The clearest gap is the long head of the triceps. On isolation against compound exercises for muscle growth, the ACSM's 2026 review of reviews had insufficient data to decide,² which leaves small trials like these as the evidence.

What to add: an overhead extension and a curl

If the count comes up short, or you want more for your arms than the compounds give, two exercises fill the gaps.

An overhead triceps extension

The long head is stretched when your arm is overhead. In a 12-week trial, 21 adults trained one arm with cable triceps extensions overhead and the other with the arm down at their side. The overhead arm's whole triceps grew 19.9% against 13.9%, and its long head 28.5% against 19.6%, even though that arm lifted lighter weights.⁹ Pushdowns still count as triceps sets. If you only have room for one triceps exercise, make it the overhead one.

A curl you'll keep doing

Two 2026 trials compared curl versions arm against arm. In 21 untrained adults over 12 weeks, incline and preacher dumbbell curls grew the elbow flexors by similar totals, 17.6% and 19.2%; the incline curl favored the biceps, and the preacher curl the brachialis and brachioradialis.¹⁰ In 24 untrained men over ten weeks, cable curls with the upper arm drawn back or kept at the side grew the elbow flexors by about 7% to 9% either way.¹¹ So the version matters less than the habit: pick a curl you can load and keep adding to.

Where arms go in the week

After the compounds. In a six-week trial, 36 young men trained with the multi-joint lifts first or the single-joint exercises first. Their biceps grew about the same either way, 14.2% and 13.8%, but only the compounds-first group's mid-thigh grew by a significant margin.¹² For strength programs, the ACSM's 2009 stand also recommends ordering multiple-joint lifts ahead of single-joint exercises.¹³ So the triceps extension goes after the presses and the curl after the rows: on a split, at the end of the push and pull days, or of each upper day.

Two direct sets of each, twice a week, on top of the compounds above:

Sets of about 8 to 15 reps suit both exercises. They can go closer to failure than your presses: reps in reserve names curls as a good place to go to 0 or 1 in reserve. Add a direct set only when the arm lifts in your log stop climbing.

With dumbbells, cables or no weights

• Dumbbells: incline or preacher curls, the two versions in the 12-week dumbbell trial, and an overhead extension holding one dumbbell in both hands. (Dumbbell or barbell curls? Dumbbell vs barbell compares them.)
• Machines and cables: a cable or machine curl, the overhead cable extension from the triceps trial, and the pushdown as a second triceps exercise.
• No weights: close-hand push-ups and chin-ups. In 40 people, 11 men and 29 women, the triceps was more active with the hands close together than wide apart.¹⁴ In 25 people, 21 men and 4 women, chin-ups produced more biceps activity than pull-ups.¹⁵ Both studies measured muscle activity during the exercise, not growth over weeks. How to do push-ups and how to do a pull-up cover the technique.

What the arm studies can't tell you

The trials above are small, 10 to 43 people each, nearly all in men and many in people new to lifting. The one trial in trained men measured arm size around the arm, a rougher measure than the ultrasound or MRI most of the others used. Whether the same pattern holds after years of lifting is less clear, so let your logbook settle it: if your curl and your triceps extension keep climbing, the plan is doing its job.

Common mistakes

• Counting only curls. Your rows and presses are arm sets too, at half a set each.
• Arms before the big lifts. They go last, after the presses and pulls they help with.
• Only pushdowns. Keep an overhead extension for the long head.
• Swinging the weight up. Leaning back on a curl hands part of the work to your hips. Go lighter and keep your elbows still.
• Curling through pain. Sharp pain is a different thing from soreness. Stop, and see a doctor or a physical therapist.

If you'd rather not plan it alone

Halving a set count is simple arithmetic; deciding how many direct arm sets your week can carry on top of everything else is the part a page can't do. Coaching is the version where your workouts live in the Trainerize app, built around the days you actually have, and a weekly call looks at the week you just had and rebuilds the next one. Coaching to build muscle explains how that works, and here's how to apply. Otherwise: add up last week's presses and pulls, halve them, and add the curls and extensions that close the gap.