How Many Sets Per Week? What Studies Found

Quick answer

Pooled studies point to at least 10 hard sets per muscle group per week for muscle size, with returns that flatten out around 18 to 20 sets. For strength, returns diminished beyond 2 to 3 sets per exercise. Fewer sets still produced gains in trials, so 10 is a mark in the data, not a minimum for progress.^1,2

Key facts

The American College of Sports Medicine's 2026 stand found muscle size was greater with 10 or more weekly sets per muscle group, with diminishing returns beyond about 18 to 20 weekly sets.¹
In 15 studies, each extra weekly set was linked to a muscle gain about 0.37 percentage points larger, and higher volumes beat lower ones by about 3.9 percentage points.³
A review of 7 trials in trained young men suggested 12 to 20 weekly sets per muscle group. Quadriceps and biceps grew similarly at 12 to 20 and at more than 20 sets, while triceps grew more at the higher volume.⁴
In an 8-week trial of 34 trained men, 1, 3 or 5 sets per exercise gave the same strength gains, while upper-arm and thigh size grew more with more sets.²
A 2026 meta-regression of 67 studies and 2,058 people found diminishing returns for both size and strength, steeper for strength.⁵

How many sets per week per muscle group the studies point to

No study has found one number that suits everyone. What the research does give is a graded relationship: more weekly sets tend to mean more muscle size, up to a point. We list four of the larger analyses below so you can see where the ranges come from.^1,5

What four pooled analyses found about weekly sets^1,3,4,5
Source	People studied	What it found
ACSM position stand, 2026	Healthy adults, 137 reviews of trials	10 or more weekly sets per muscle group favored size. Returns diminished beyond about 18 to 20 sets. At least 2 sets per exercise advised.
Schoenfeld and colleagues, 2017	15 studies, 34 groups	Each extra weekly set was tied to about 0.37 points more muscle gain. Comparing under 5, 5 to 9 and 10 or more sets showed only a trend.
Baz-Valle and colleagues, 2022	7 trials, trained men aged 18 to 35	12 to 20 sets per muscle was suggested. More than 20 sets helped the triceps but not the quadriceps or biceps.
Pelland and colleagues, 2026	67 studies, 2,058 people, about 79% male, average age about 25	More sets meant more size and strength, with diminishing returns. The effect on strength leveled off faster.

How to count a set

Trials differed in how hard they took each set, so we use a working definition: a set that ends with about 2 or 3 repetitions left, the effort level the ACSM review describes as adequate. Warm-up sets and easy sets do not count toward the totals above.¹

Muscles overlap, so a bench press also works the triceps and front of the shoulder. The 2026 meta-regression tested several ways of counting these indirect sets and found that counting each one as half a set predicted results best. If you add up sets per muscle, count the muscle the exercise is aimed at in full and the helpers at half.⁵

How many sets per week for biceps, chest and other muscles

Few reviews report a separate number for each muscle. The one that did, in trained young men, covered the quadriceps, biceps and triceps and found the biceps and quadriceps grew about the same on 12 to 20 weekly sets as on more than 20. The triceps was the exception, growing more on the higher volume.⁴

In the 8-week trial of 34 men, the elbow flexors, which include the biceps, grew more with 3 or 5 sets per exercise than with 1, across 3 sessions a week. We found no review that reports a separate figure for the chest, so the general range is the best guide. Spreading the sets across two sessions fits the frequency evidence: when total volume is equal, studies find no meaningful size difference between lifting a muscle once and several times a week.^2,6

What fewer sets still do

The same trial found that men who did 1 set per exercise gained strength as much as those who did 5, in three weekly sessions of about 13 minutes. Strength rose in every group, and size rose at most measured sites. A network meta-analysis of 178 strength trials found every program tested beat no exercise.^2,7

For people aged 60 and over, a network meta-analysis of 151 trials found low weekly volume was enough for gains in lean mass, muscle size and physical function, while moderate or high volume seemed to be needed for the largest strength gains. A narrative review of maintenance work found that strength and size in younger people were kept for up to 32 weeks on one session a week with one set per exercise, provided the load stayed the same.^8,9

What these numbers cannot tell you

Most participants were young men, and trials ran for weeks, not years. The figures are averages across groups, so any one person may respond more or less. The ACSM authors say the exact number of sets that gives the best results cannot be pinned down from the available data, and that more than two sets per exercise may add benefit that shrinks with each extra set.^1,5

Stop and ask a doctor if

Raising your weekly sets brings pain, not just muscle soreness. MedlinePlus says to stop if you feel pain and to contact a provider for muscle or joint pain that does not go away after self-care.¹⁰
You feel worn out for more than a week or two while adding volume. MedlinePlus lists constant tiredness and falling performance among signs of too much exercise and says to see a provider if rest of 1 or 2 weeks does not help.¹¹

Add volume gradually. MedlinePlus advises against raising the number of days, the length of time and the effort all at once, so add a set or two to one muscle at a time and see how you recover.¹⁰

Questions people ask

How many sets per week per muscle?

The ACSM's 2026 stand found muscle size was greater at 10 or more weekly sets per muscle group, with fewer sets still giving gains in trials. For strength, returns diminished beyond 2 to 3 sets per exercise.¹

How many sets per week for hypertrophy?

Pooled analyses show gains rising with sets and flattening around 18 to 20 sets per muscle group a week. A review of trained young men suggested 12 to 20.^1,4

How many sets per week per muscle group, if exercises overlap?

A 2026 meta-regression found that counting indirect sets as half a set fit the data best, so a bench press set counts as a full set for the chest and half a set for the triceps.⁵

How many sets per week for biceps?

In trained young men, 12 to 20 weekly sets grew the biceps about as much as more than 20. In another trial, the elbow flexors grew more with 3 or 5 sets per exercise than with 1.^2,4

How many sets per week for chest?

We found no review that reports a separate number for the chest, so the general range applies: 10 or more hard sets a week favored size. Press sets also count at half value toward the triceps.^1,5

Can too many sets a week backfire?

The pooled studies show diminishing returns rather than harm. MedlinePlus lists constant tiredness and falling performance as signs of too much exercise, and advises seeing a provider if rest does not fix it.^5,11

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This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.