What's the best workout split for 3, 4, 5 or 6 days?
Short answer: the best workout split is whichever one gets every major muscle trained twice a week with enough hard sets, on days you'll actually show up. That works out to full body at 2–3 days a week, upper/lower at 4, push/pull/legs plus upper/lower at 5, and push/pull/legs twice at 6. Research comparing splits finds they all build similar muscle and strength when weekly volume is matched; the calendar decides, not the name.
What the research says about splits
Three findings settle most of the argument:
- Frequency matters, a little. A 2016 meta-analysis found that training a muscle twice a week grew it more than once a week. In a 2015 trial with well-trained men, a three-day full-body routine beat a once-a-week "bro split" for arm growth on the same total sets.
- Volume matters more. The most recent dose-response analysis of 67 studies found that weekly sets drive muscle growth, while frequency by itself had a negligible effect on size (and a clear effect on strength). Once you've split the volume across at least two sessions, more splitting doesn't add much.
- Split vs. full body is a draw when volume is equal. A 2021 trial with 67 people compared an A/B split against a full-body routine at matched weekly volume and found almost identical strength gains (bench +18% vs +17.5%, squat +28% vs +29%).
So: pick a structure that hits each muscle at least twice, load it with 10–20 hard sets per muscle per week (see how many sets and reps you should do), and stop optimising the name.
Best workout split for 3 days a week
Full body, three times. Every session: one squat pattern, one hinge, one push, one pull, one or two accessories — 15–20 hard sets. Each muscle gets hit three times, sessions run 50–70 minutes.
| Day | Session |
|---|---|
| Mon | Squat · bench press · row · Romanian deadlift · lateral raise · curl |
| Wed | Deadlift · overhead press · pull-up · leg press · triceps · calves |
| Fri | Front squat · incline press · chest-supported row · leg curl · face pull · abs |
The alternative at three days is upper / lower / full, which works if you like a lighter third day. Push/pull/legs at three days means each muscle once a week — legal, but it gives up the frequency advantage.
Best workout split for 4 days a week
Upper / lower, twice through. The most popular split for a reason: each muscle twice a week, sessions under an hour, and you can bias one upper day toward pressing and the other toward pulling.
| Day | Session |
|---|---|
| Mon | Upper A: bench · row · overhead press · pulldown · curl · triceps |
| Tue | Lower A: squat · Romanian deadlift · leg press · leg curl · calves |
| Thu | Upper B: incline press · chest-supported row · lateral raise · pull-up · curl · triceps |
| Fri | Lower B: deadlift · hack squat · split squat · leg extension · calves |
Ideal spacing is two-on, one-off, two-on, two-off. If your week doesn't allow that, back-to-back upper and lower days are fine because they don't share muscles.
Best workout split for 5 days a week
Push / pull / legs / upper / lower. Push-pull-legs covers everything once; the upper and lower days cover it a second time.
| Day | Session |
|---|---|
| Mon | Push: bench · overhead press · incline dumbbell press · lateral raise · triceps |
| Tue | Pull: deadlift · row · pulldown · face pull · curl |
| Wed | Legs: squat · Romanian deadlift · leg press · leg curl · calves |
| Fri | Upper: incline press · chest-supported row · pull-up · lateral raise · curl · triceps |
| Sat | Lower: front squat · hip thrust · split squat · leg extension · calves |
The other five-day option is a rotating push/pull/legs (P-P-L-rest-P-P-rest, continuing the cycle): each muscle lands roughly every 4–5 days. It works, but the schedule drifts across the calendar, which is harder to keep.
Best workout split for 6 days a week
Push / pull / legs, twice. Each muscle twice a week, sessions 40–60 minutes because you're only training a third of the body. Only for people whose sleep and food are in order — six hard days is a recovery bill, and a 2026 ACSM position stand found no advantage to "complicated" over simple for the average person.
Rule for six days: no muscle two days in a row, and one of the two weekly sessions per muscle can be lighter (higher reps, machines) so you're not maxing out twelve times a week.
Best split for muscle gain vs. strength vs. fat loss
- Muscle gain: any of the above at 10–20 sets per muscle per week. Full body at 3 and upper/lower at 4 are the most reliable.
- Strength: frequency helps strength more than it helps size — practice the main lifts 2–3 times a week. Full body or upper/lower, with the big barbell lifts first, low reps, long rests.
- Fat loss: same as muscle gain — the split doesn't burn the fat, the deficit does. Three or four lifting days protect your muscle; add walking and cardio on the other days (see cardio before or after weights).
- Beginners: full body, 2–3 days. Learn the lifts, add weight every session, don't split a body that doesn't have enough training volume to split yet.
How to pick, in three questions
- How many days can you truly train, every week, for the next three months? Not your best week — your normal one. That number picks the split from the table above.
- Does every muscle get hit at least twice? If not, restructure.
- Can you finish each session in 45–75 minutes with 2–3 minutes' rest on the big lifts? If not, you have too many exercises, not too few days.
Then run it for at least 8–12 weeks before changing anything. Splits don't stop working; people stop progressing them.
How Stelvo handles this
Tell the coach the split you run — "I do upper/lower" or "push/pull/legs" — and it programs the next day in the rotation from what you last trained, instead of guessing from a template. Miss a day and the rotation continues from where you actually are. It also asks how many days you can train up front, so the plan matches your calendar rather than an idealised one.
FAQ
Is push/pull/legs better than upper/lower?
Not for muscle growth. At matched weekly volume they produce similar results. Push/pull/legs suits 6 days; upper/lower suits 4. Pick by calendar.
Is a bro split bad?
Training each muscle once a week works, but the evidence favours twice. If you love a body-part split, run it as a five-day rotation with a second touch on lagging muscles.
Can I build muscle on a 3-day split?
Yes — three full-body sessions is one of the best-supported setups in the research and enough volume for years of progress.
How long should I stay on a split?
At least 8–12 weeks. Change it when your life changes (fewer or more days), not because you're bored — boredom is fixed by swapping exercises, not the structure.
Sources
- 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.
- Schoenfeld BJ, Ratamess NA, Peterson MD, Contreras B, Tiryaki-Sonmez G. Influence of Resistance Training Frequency on Muscular Adaptations in Well-Trained Men. Journal of Strength and Conditioning Research, 2015.
- Pelland JC, et al. The Resistance Training Dose Response: Meta-Regressions Exploring the Effects of Weekly Volume and Frequency on Muscle Hypertrophy and Strength Gains. Sports Medicine, 2025.
- Evangelista AL, et al. Split or full-body workout routine: which is best to increase muscle strength and hypertrophy? einstein (São Paulo), 2021.
- American College of Sports Medicine. Position Stand: Resistance Training Prescription for Muscle Function, Hypertrophy, and Physical Performance in Healthy Adults. Medicine & Science in Sports & Exercise, 2026.
General fitness information, not medical advice.