How many times per week should you train each muscle?

What the evidence says about training frequency per muscle group, with the references.

~3 min read·last reviewed ·3 sources linked

From the same series: how many sets per muscle? · do you have to train to failure? · how long to rest between sets? · the whole series

Short answer: what drives growth is total weekly volume per muscle, not how many days you spread it over: doing the same total number of sets, training a muscle 1, 2 or 3 times per week produces similar growth. Frequency helps indirectly — splitting across two or more days makes it far more feasible to accumulate quality sets — and for strength, practising the lift more often does add something.

With the same sets
≈ equal
1×, 2× or 3× per week: similar hypertrophy if weekly sets are the same2
Frequency's real use
2+ days
splitting makes it easier to reach your sets for the week without them dropping in quality
For strength
+practice
repeating the lift more often gives a bit more strength, less each time1

§1The honest history: the finding that didn't survive more data

In 2016, the first frequency meta-analysis (10 studies) found that training each muscle twice per week beat once3. Three years and fifteen studies later, the same authors re-analysed it: doing the same sets per week, the difference disappears — frequency can be chosen by personal preference2. And in 2026, the finest statistical re-analysis to date (Pelland's meta-regressions) confirmed it for hypertrophy: separating out the effect of volume, frequency's own effect is compatible with being negligible1. It's a good reminder of how evidence works: the 2016 finding wasn't a lie — it was what 10 studies could see.

§2What does each review of the research say?

How to read these numbers: a meta-analysis pools and re-analyses every published study on a question. ES and SMD measure effect size — how much real difference there is between groups: 0.2 is considered small, 0.5 medium. The CI (confidence interval) is the margin of error: if it includes zero, the difference may not exist. An RCT is a trial with randomly assigned groups.
The three reviews of the research on how often to train each muscle, in order of publication.
StudyBaseResult
Schoenfeld 2016310 studies2×/week better than 1× (ES 0.49 vs 0.30); not enough data on 3×.
Schoenfeld 2019225 studiesWith the same sets per week, no meaningful difference between frequencies; frequency as a tool to accumulate volume.
Pelland 202612026 re-analysisHypertrophy: frequency's own effect compatible with negligible. Strength: more frequency → more gain (100 % certainty in the model), with diminishing returns.

§3How do you apply it?

Choose frequency for logistics, not magic: the right question is "with which split do I reach my weekly sets for each muscle at good quality?". Twelve sets of chest fit badly into one day — the last ones come out empty — and well into two. That's why the usual splits (full-body 3 days, upper/lower 4, push/pull/legs 6) end up giving most muscles a frequency of 2: not because 2 is sacred, but because it spreads the volume where it can be done well. If you train for strength, there's an extra reason for higher frequencies: practising the lift more often per week adds on its own.

§4References

  1. Pelland, J. C., Remmert, J. F., Robinson, Z. P., Hinson, S. R., & Zourdos, M. C. (2026). The resistance training dose–response: meta-regressions exploring the effects of weekly volume and frequency on muscle hypertrophy and strength gains. Sports Medicine, 56(2), 481–505. doi.org/10.1007/s40279-025-02344-w
  2. Schoenfeld, B. J., Grgic, J., & Krieger, J. (2019). How many times per week should a muscle be trained to maximize muscle hypertrophy? A systematic review and meta-analysis of studies examining the effects of resistance training frequency. Journal of Sports Sciences, 37(11), 1286–1295. doi.org/10.1080/02640414.2018.1555906
  3. Schoenfeld, B. J., Ogborn, D., & Krieger, J. W. (2016). Effects of resistance training frequency on measures of muscle hypertrophy: a systematic review and meta-analysis. Sports Medicine, 46(11), 1689–1697. doi.org/10.1007/s40279-016-0543-8