How Often Should You Train Each Muscle?
Once, twice or three times a week? What frequency meta-analyses show when weekly volume is equal, and how to choose a split you can sustain.
The short answer
When weekly volume is the same, training a muscle once, twice or three times a week produces similar growth. Frequency is mainly a tool for fitting in enough good-quality sets.
What the evidence says
A 2016 meta-analysis suggested training each muscle at least twice a week was better than once. A larger 2019 meta-analysis concluded there is strong evidence that frequency does not meaningfully affect growth when volume is equated, so lifters can choose a weekly frequency by preference.
For strength, the 2026 ACSM position stand found that two or more sessions per week enhanced gains.
How to choose
Split the weekly sets so no single session becomes so long that the last exercises get sloppy.
- 3 days a week: full-body sessions train everything three times with modest per-session volume.
- 4 days a week: upper/lower trains each muscle twice.
- 5–6 days: push/pull/legs or body-part splits work if you enjoy them and recover well.
Common mistakes
- Choosing a six-day split you cannot attend consistently.
- Cramming 20 sets for one muscle into one session.
Bottom line
Pick the schedule you can keep; distribute your weekly sets so each session stays high quality.
References
- [1] Schoenfeld BJ, Ogborn D, Krieger JW. Effects of resistance training frequency on measures of muscle hypertrophy: a systematic review and meta-analysis. Sports Medicine. 2016;46(11):1689–1697. Systematic review and meta-analysis doi.org/10.1007/s40279-016-0543-8
- [2] Schoenfeld BJ, Grgic J, Krieger J. 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. 2019;37(11):1286–1295. Systematic review and meta-analysis doi.org/10.1080/02640414.2018.1555906
- [3] Currier BS, D’Souza AC, Fiatarone Singh MA, et al. American College of Sports Medicine Position Stand. Resistance Training Prescription for Muscle Function, Hypertrophy, and Physical Performance in Healthy Adults: An Overview of Reviews. Medicine & Science in Sports & Exercise. 2026;58(4):851–872. Position stand (overview of 137 systematic reviews) doi.org/10.1249/MSS.0000000000003897
This guide summarises published research for healthy adults. It is general information, not medical advice — if you have a health condition, injury or take medication, talk to a qualified professional before changing your training or supplements.
