How Often to Lift Weights: Days a Week

Quick answer

Lifting each major muscle group at least twice a week is the common floor: NIH advises two or more days and the 2026 American College of Sports Medicine stand says at least twice weekly. Strength trials found larger gains at 3 to 4 sessions, mostly because those people did more total sets.^1,2,3

Key facts

The ACSM's 2026 primary recommendation is high-effort resistance training at least twice a week, with all major muscle groups worked.²
In 22 studies, strength effect sizes were 0.74, 0.82, 0.93 and 1.08 for training 1, 2, 3 and 4 or more times a week, but there was no significant effect of frequency when total volume was equal.³
In 25 studies, muscle size did not differ meaningfully between higher and lower weekly frequencies when volume was equal, for the upper body, the lower body and trained people.⁴
An earlier 2016 review of 10 studies found twice-weekly training per muscle group gave larger size gains than once weekly, and left open whether three times beat twice.⁵
To maintain strength and size, younger people kept them for up to 32 weeks on one session a week of one set per exercise, if the relative load stayed the same.⁶

How often to lift weights per week, according to the position stands

Weekly lifting advice from five sources^1,2,7,8,9
Source	Who it covers	How often
NIH MedlinePlus, 2025	Adults	Strengthening activities on two or more days a week for all parts of the body
ACSM position stand, 2011	Apparently healthy adults	Resistance exercise for each major muscle group on 2 to 3 days a week
ACSM position stand, 2009	Healthy adults by experience	2 to 3 days for novices, 3 to 4 for intermediate and 4 to 5 for advanced lifters
ACSM position stand, 2026	Healthy adults, 137 reviews	At least twice a week with all major muscle groups and high effort
WHO guidelines, 2020	All age groups	Regular muscle-strengthening activity, as well as aerobic activity

Notice what is common to the sources. The shared floor is two sessions per muscle group. The 2009 stand adds more days for intermediate and advanced lifters, while the 2026 stand says the upper limit cannot be worked out from its data, because frequency effects faded once total volume was matched.²

Does lifting more often help, or do more sets?

Reviews that compared groups doing the same total number of sets found little or no benefit from spreading them over more days. For strength, the 22-study review found a gradient of effect sizes from 1 to 4 sessions a week, yet no significant effect once volume was equal, and the authors concluded that extra sessions help mainly by letting you fit in more sets. A 2026 meta-regression of 67 studies, using a different method, found a clear frequency effect on strength gains with diminishing returns, and an effect on muscle size that was compatible with negligible.^3,10

The 2019 review of 25 studies concluded that, for a given training volume, people can pick the weekly frequency per muscle group they prefer. The 2016 review that favored twice over once a week included only 10 studies. Our reading is that the twice-a-week floor is well supported, and that three or more sessions are a matter of fitting work around your life, not a requirement.^4,5

A network meta-analysis (178 trials for strength and 119 for size) ranked higher-load, multiple-set training three times a week first for strength, and the same approach twice a week first for muscle size. All of the programs it compared beat no exercise.¹¹

How often to lift legs

The 2019 review checked for differences by body region and found none between higher and lower weekly frequencies for either the upper or the lower body when volume was equal. In practice that means legs once a week with more sets and legs twice a week with fewer per day are comparable on paper, so choose by how you recover and how your schedule runs. In the 22-study strength review, the frequency effect was clearer for upper-body than lower-body gains.^3,4

How often to lift to maintain muscle

A narrative review of maintenance studies found that strength and muscle size in younger people were kept for up to 32 weeks on as little as one strength session a week with one set per exercise, as long as the relative load stayed the same. In older people, keeping muscle size may need up to two sessions a week with 2 to 3 sets per exercise.⁶

The reviewers concluded that intensity, meaning how heavy the load is relative to your maximum, seems to be the key variable for maintaining performance, even when frequency and volume are cut a lot. For a busy stretch of life, the evidence points to keeping the weights and cutting sessions or sets.⁶

What the frequency studies leave out

The authors of the strength review noted that most studies used untrained participants, and that frequency had a statistically significant effect on strength in young adults but not in middle-aged and older adults. Women showed a significant frequency effect on strength and men did not. These are subgroup results from small numbers of studies, so take them as hints.³

How to divide the weekly work across days is covered in our full-body and push, pull, legs guides. The trials above compared totals, not specific splits.⁴

Rest days and when to stop and ask a doctor

MedlinePlus advises taking a full day off every week, and lists constant tiredness, falling performance, getting overuse injuries and needing longer to rest among signs of too much exercise. It says to cut back or rest for 1 or 2 weeks, and to see a provider if you are still tired after that.¹²

Stop and ask a doctor if a joint or muscle hurts for longer than self-care should need. MedlinePlus says to contact a provider for muscle or joint pain that does not go away.¹³
Ask a doctor first if you have known heart, metabolic or kidney disease, or symptoms, before raising how often you train. ACSM's screening advice weighs these factors.¹⁴

Questions people ask

How often to lift weights per week?

Two sessions a week that work all major muscle groups is the floor in NIH and ACSM advice. Strength gains rose with 3 to 4 sessions in pooled trials, but the effect faded when total sets were equal.^1,2,3

How often to lift to build muscle?

A review of 25 studies found no meaningful size difference between higher and lower weekly frequencies once volume was equal, so pick the pattern you can keep. Twice a week per muscle group is the best-supported starting point.^4,5

How often to lift weights to maintain muscle?

In a review of maintenance studies, younger people kept strength and size for up to 32 weeks on one session a week with one set per exercise at the same relative load. Older people may need two sessions.⁶

How often to lift legs?

Twice a week is the usual floor for any muscle group. A 2019 review found no meaningful difference between higher and lower frequencies for the lower body when total volume was equal.^2,4

How often to lift weights if you are recovering slowly?

MedlinePlus advises a full day off every week and, if you are run down, cutting back or resting for 1 or 2 weeks before adding more. It lists constant tiredness and falling performance as signs of too much exercise and says to see a provider if rest does not fix them.¹²

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Sources

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