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quantitative
Analysis v1
Supported

If you're new to lifting, doing three sets of an exercise might not build more muscle than just doing one set—as long as you push each set to the point where you can't lift anymore.

50
Pro
47
Against

Evidence from Studies

Supporting (3)

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Community contributions welcome

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Resistance Training Performed With Single and Multiple Sets Induces Similar Improvements in Muscular Strength, Muscle Mass, Muscle Quality, and IGF-1 in Older Women: A Randomized Controlled Trial.

Randomized Controlled Trial
Human
2020 Apr

The study found that doing one set or three sets of exercises led to similar muscle gains in older women who were new to training, as long as they went to failure. This supports the idea that more sets aren’t always better.

25

Pectoralis Clavicular and Sternocostal Thicknesses Increase Similarly in Response to One and Three Sets of Pec Deck Resistance Training in Untrained Young Men

Cross-Sectional Study
Human
2025 May 1

The study found that doing one set or three sets of an exercise led to the same amount of muscle growth in beginners who trained to failure, so more sets didn’t help extra.

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Pectoralis Clavicular and Sternocostal Thicknesses Increase Similarly in Response to One and Three Sets of Pec Deck Resistance Training in Untrained Young Men

Randomized Controlled Trial
Human
2025 May 1

The study found that doing one set or three sets of an exercise gives similar muscle growth in beginners if they go all the way to failure, which supports the idea that more sets aren’t always better.

Contradicting (1)

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Community contributions welcome

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DISSIMILAR EFFECTS OF ONE‐ AND THREE‐SET STRENGTH TRAINING ON STRENGTH AND MUSCLE MASS GAINS IN UPPER AND LOWER BODY IN UNTRAINED SUBJECTS

Randomized Controlled Trial
Human
2007 Feb

The study found that doing three sets built more leg muscle than one set in beginners, but there was no difference for upper-body muscles. So overall, more sets helped more in some areas.

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Similar Assertions

Going all the way to exhaustion on every set probably doesn't build more muscle than stopping a few reps short — both seem to work about the same.

64
54
76%

When you lift weights and push yourself almost to the point of not being able to do another rep, you’re more likely to build bigger muscles than if you stop earlier — even if you’re lifting the same weight or doing the same number of sets.

39
0
75%

Compound exercises involving greater total muscle mass do not produce superior hypertrophy in target muscles compared to isolation exercises when training volume and effort are equated.

55
48
73%

For young guys who don't usually exercise, doing one set or three sets of heavy lifting doesn't make a big difference in muscle growth, but three sets might have a small, not-proven benefit.

46
0
73%

If you lift weights and push your muscles closer to total exhaustion, you’ll likely gain more muscle size than if you stop earlier — even when doing the same number of sets and reps.

33
0
73%

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