Full body vs split: how often should you train each muscle?
What research says about training frequency, and how to pick the split that fits your schedule.
Full body three times a week, upper/lower, push pull legs, or the classic "one muscle per day" bro split: every gym has its fans. Behind all these splits sits a single variable, frequency, meaning how many times you train the same muscle each week.
What the research says
In 2016, a first meta-analysis by Brad Schoenfeld concluded that training a muscle at least twice a week gave better results than once. In 2019, the same team revisited the question with 25 studies and reached a more nuanced finding.
When volume is equal, meaning the same total number of sets per week, frequency does not meaningfully change muscle growth. Whether you do your 12 sets of back in one session or across three, the result is similar. The authors conclude that people can choose their frequency based on personal preference.
In practice, higher frequency is still useful: it lets you spread a large volume over several sessions, with better-quality sets at the end of each workout. It is weekly volume that matters most; frequency mostly makes it manageable.
Which split for your schedule
- 2 to 3 sessions a week: full body is the most efficient. Every muscle gets trained each session, so 2 to 3 times a week.
- 4 sessions a week: an upper/lower split hits each muscle twice, with shorter sessions.
- 5 to 6 sessions a week: push pull legs run twice keeps a frequency of 2 per muscle with high volume.
- The "one muscle per day" split works too, as long as total weekly volume is enough. It is less forgiving of missed sessions: skip leg day and that is a week without legs.
The best program is the one you stick to
Since frequency matters little when volume is equal, the real criterion is consistency. A three-day full body kept up for a year beats a six-day split dropped after a month. Pick the split that fits your actual schedule, not the one you wish you had.
Building your program with Loaden
- The AI coach generates a program tailored to your schedule, equipment, goals and any injuries, in seconds.
- You can also build your own in the visual builder, picking exercises by muscle group or on the anatomy view.
- Machine taken? Swap the exercise mid-workout without breaking your program.
To learn more about AI-generated programs, read how to build a workout program around injuries.
Sources
- Schoenfeld B.J. et al., "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.
- Schoenfeld B.J. et al., "Effects of Resistance Training Frequency on Measures of Muscle Hypertrophy: A Systematic Review and Meta-Analysis", Sports Medicine, 2016.
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