AImThe best workout split is the one that fits your week
There is no single best split, and anyone who tells you otherwise is selling something. There is a best split for the number of days you can genuinely train. Two or three days: full body. Four: upper lower. Five: upper lower plus a day. Six: push pull legs run twice. The rest of this page is the reasoning, so you can trust the row you land on.
Start with the only variable that matters
Before comparing splits, answer one question honestly: how many days a week will you train, on a bad week rather than a good one? Not how many you would like to. The split follows from that number, and almost every bad split choice comes from answering it optimistically.
The reason it decides everything is muscle frequency. Hypertrophy research on training frequency broadly agrees that hitting a muscle twice a week beats once, given the same total sets. A split that spreads your body over six days only works if you actually turn up six times. Miss two and you have skipped entire muscle groups for the week.
The short answer
| Days a week | Sensible choice | Muscle frequency |
|---|---|---|
| 2 | Full body | 2x |
| 3 | Full body | 3x |
| 4 | Upper lower, or push pull | 2x |
| 5 | Upper lower plus a PPL day, or a bro split | 1 to 2x |
| 6 | Push pull legs, twice through | 2x |
Notice that most rows land on twice a week per muscle. That is not a coincidence, it is the thing the splits are arranged around.
Full body
Every session trains the whole body, usually one or two exercises per major muscle group.
Suits: two or three days a week, beginners, and anyone whose schedule collapses regularly. If you can only train twice, this is not a compromise, it is the correct answer.
Why it works: every muscle gets trained two or three times a week even on a small number of sessions, and missing one day costs you a fraction of each muscle's volume rather than all of one muscle's.
The catch: sessions get long if you add too much, and the muscles you train last are always the tired ones. Rotate which body part opens the session.
Upper and lower
Alternating upper body and lower body days.
Suits: four days a week, and it is arguably the best default for most intermediate lifters.
Why it works: four sessions gives every muscle two exposures a week, which is the frequency the evidence supports, with enough room per session to do real volume without a two hour workout.
The catch: upper days carry a lot: chest, back, shoulders and arms all want attention. Expect them to run longer than leg days, and be willing to let arms ride on the compound work some weeks.
Push, pull, legs
Pushing muscles (chest, shoulders, triceps), pulling muscles (back, biceps), then legs. Run once through for three days a week, or twice for six.
Suits: six days a week if you want the frequency, or three if you accept training each muscle once.
Why it works: muscles that work together are trained together, so nothing is asked to perform twice while still sore. It is also easy to remember and hard to get wrong.
The catch: at three days a week each muscle is trained once, which is the frequency the evidence likes least. At six days it is excellent and it is also six days. Be honest about which version you are actually running.
Push and pull
Two rotating days: everything that pushes, then everything that pulls, with legs folded into whichever day suits the exercise.
Suits: four days a week, and people who dislike dedicated leg days enough to skip them.
Why it works: the same logical grouping as PPL with fewer session types to schedule, so it survives an irregular week better.
The catch: legs get less focused attention than on any split with a dedicated lower day. If your goal is lower body, choose something else.
The bro split
One muscle group per day: chest Monday, back Tuesday, and so on across five days.
Suits: five days a week, advanced lifters with high volume per muscle, and anyone who genuinely enjoys it enough to keep showing up.
Why it works: you can pile a lot of volume onto one muscle and then leave it alone for a week to recover fully. It has a poor reputation online and it has built plenty of muscle on people who trained hard.
The catch: once a week per muscle is the lowest useful frequency, and it punishes a missed session hard. Skip Thursday and your shoulders got nothing for seven days. It also needs five sessions to work at all.
The split matters less than what you do inside it
Worth saying plainly, because the question gets far more attention than it deserves. Split choice is a scheduling decision. It decides when you train a muscle, not how much it grows. What decides that is total hard sets per week, whether you add load over time, and whether you keep turning up.
Two people running different splits with the same weekly sets, the same effort and the same consistency will get similar results. The frequency edge this page keeps pointing at is real, but it is a small lever next to those three. Someone who switches split every six weeks looking for the optimal one will get worse results than either, because they never stay anywhere long enough to add weight to the bar.
Pick the row that matches your real week, run it for a few months, and spend your attention on progression instead. The progressive overload guide covers the pacing and the volume numbers, and the 1RM calculator turns any set into a comparable strength number.
Checking it is working
The useful check is not whether you picked the fashionable split, it is whether each muscle is getting enough hard sets across the week. That is arithmetic, and it is the kind of arithmetic nobody does by hand for long.
With AIm connected, the assistant builds the split around your real availability and equipment, and the app shows a muscle map of the week's sets against the recommended range for each muscle, so an undertrained group is visible rather than theoretical.
Frequently asked questions
What is the best workout split for muscle gain?
The one matching the days you reliably train. Two or three days: full body. Four: upper lower. Six: push pull legs run twice. Most of these land on training each muscle twice a week, which the evidence supports over once.
What is the best workout split for fat loss?
The same split you would run for muscle gain. Fat loss is decided by the calorie deficit, not by the split, and the job of lifting in a deficit is to keep the muscle you have. Pick the split that matches your days, keep the weights heavy, and put cardio after lifting or on rest days rather than redesigning the week around it.
Is push pull legs better than upper lower?
Only if you train six days. At six days PPL gives every muscle two sessions, the same as upper lower at four. Run PPL over three days and each muscle is trained once a week, which is worse than a four day upper lower.
Is the bro split bad?
No, it is just demanding. It needs five sessions a week to cover the body once, so it has the lowest frequency of the common splits and a missed day costs a whole muscle group for the week. Trained hard and attended consistently, it works.
What is the best workout split for beginners?
Full body, three days a week. It teaches the main lifts fastest because you practice them every session, each muscle is trained three times a week, and a missed day costs you a third of the week instead of a whole muscle group.
What is the best workout split for women?
The same logic applies: pick by the days you actually have. What usually differs is emphasis, not structure. If glutes and legs are the priority, a four day upper lower with the lower days first in the week fits that goal without inventing a special split.
What is the best workout split for an aesthetic physique?
There is no special aesthetics split. Proportions come from biasing volume toward the muscles that set the look, usually shoulders, upper chest, lats and arms. Pick the split by your days, then give those muscles the first slot in the session and a couple of extra sets each week.
What is the best 3 day split?
Full body. Three full body days train each muscle three times a week. Push pull legs run once through also fits three days but trains each muscle once, so it only wins if the variety is what keeps you showing up.
What is the best 5 day split?
An upper lower plus push pull legs hybrid covers every muscle twice in five days. The classic bro split also takes five days but covers each muscle once, so the hybrid is the stronger default unless you specifically enjoy one muscle per day.
How often should I change my split?
Rarely. A split is worth keeping for months, because the progress comes from adding load within it. Change when your available days change, not because progress slowed for two weeks.