Training each muscle at least twice a week is a good default for most people. Research shows that what matters most for muscle growth is your total weekly volume (the number of hard sets per muscle). Spreading that volume over two or three sessions usually makes those sets better quality, which is why twice a week tends to beat once a week in practice.
What the research says
A 2016 meta-analysis by Schoenfeld and colleagues found that training a muscle twice a week led to more growth than training it once a week. A follow-up review in 2019 refined the picture: when the total number of weekly sets was equal, frequency itself made little difference. The takeaway is that frequency is a tool for doing more good-quality volume, not a magic number in itself.
Practically, doing 12 hard sets for your chest in one session is miserable, and sets 9 to 12 aren't worth much. Doing 6 sets on Monday and 6 on Thursday is easier, and each set is done fresher.
Training frequency at a glance
| Frequency per muscle | Works well for | Watch out for |
|---|---|---|
| 1× per week | Busy people who still hit enough weekly sets; advanced lifters on body-part splits | Long, tiring sessions; a missed day means a missed week for that muscle |
| 2× per week | Most people: beginners to advanced | Need to plan recovery between similar sessions |
| 3× per week | Beginners on full-body plans; lagging muscles | Less volume per session; recovery for big lifts |
Sample splits by days per week
| Days | Split | Frequency per muscle |
|---|---|---|
| 3 | Full body A / B / A | 3× per week |
| 4 | Upper / Lower / Upper / Lower | 2× per week |
| 5 | Upper / Lower / Push / Pull / Legs | About 2× per week |
| 6 | Push / Pull / Legs × 2 | 2× per week |
New to lifting? Start with our 3-day full-body plan. Training four days a week? An upper/lower split is hard to beat for balance and recovery.
How to choose your split
- Start with the days you can really train. The best split is the one you can follow for months, not the one that looks best on paper.
- Make sure each muscle gets 10–20 hard sets a week. See how many sets per week.
- Leave about 48 hours before training the same muscle hard again.
- Put your priorities first in the week and in each session, when you're freshest.
Is the bro split bad?
No, it's just harder to get right. A one-muscle-per-day split can work if you do enough sets and actually show up every day. The weak points are that each muscle waits a full week for its next session, and that a missed day (usually legs, mysteriously) leaves a gap. If you love your bro split, try hitting each muscle a second time with a few sets later in the week.
Frequently asked questions
Is training a muscle once a week enough?
It can be, if you do enough hard sets. For most people, twice a week makes it easier to get good-quality volume.
Can I train the same muscle two days in a row?
For small muscles and light sessions, yes. For heavy work on the same big muscles, give them about 48 hours.
How many days a week should a beginner train?
Three full-body sessions a week is an excellent start. Four is great once you can recover well.
Sources
- 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.
- 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.
- Schoenfeld, B. J., Ogborn, D., & Krieger, J. W. (2017). Dose-response relationship between weekly resistance training volume and increases in muscle mass: a systematic review and meta-analysis. Journal of Sports Sciences, 35(11), 1073–1082.
