What does research say about splits?
The 8-week trial compared a split routine, with each muscle trained twice a week, with a full-body routine, with each muscle trained four times a week. Weekly set volume was equal, and the two groups got similar results. The 2019 meta-analysis points the same way: once volume is matched, how you divide the week matters little.
How many days do ACSM guidelines suggest?
The ACSM position stand from 2009 suggests that beginners train the whole body two to three days a week. For intermediate lifters it suggests three days of total-body sessions or four days of an upper/lower split. For advanced lifters it suggests four or more days.
Which split fits which week?
| Days you can train | Common choice |
|---|---|
| 2-3 | Full-body |
| 4 | Upper/lower |
| 5-6 | Push-pull-legs |
This table shows common choices, not rules from ACSM.
What are the pros and cons?
- Full-body: each muscle is trained several times a week, and a missed day costs little. Sessions can run long if you do many exercises.
- Upper/lower: a balance of frequency and session length that suits four days.
- Push-pull-legs: shorter sessions per day, but it needs five or six days and works poorly if you miss several.
How do you decide?
Count the days you can train most weeks, then choose the split built for that number. If your plan keeps breaking, move to fewer days or to full-body.
Roarer lets you build a plan with weeks and trainings, schedule your training days with optional reminders, and edit the program when your week changes.