By now you’ve probably met three splits, and all three came recommended as the best one. A five-day “body-part split” from someone’s feed: chest day, back day, leg day and the rest. “Push pull legs”, from a forum thread where everyone seemed to be on it. And a “full-body” plan, from someone who said the other two were a waste of your time. Meanwhile your actual week has three evenings in it, four in a good one, and the Thursday session has a habit of sliding to Friday, or off the week entirely.
They can’t all be the best. They can all be fine, though, and that’s the more useful thing to know. When researchers give two groups the same week’s work and change only how it’s divided across the days, the groups end up with about the same muscle and about the same strength, on average. The split doesn’t build the muscle. The work does. What the split decides is what your week looks like: how long each session runs, how many days in a row you train, and, more than anything else, what happens on the evening you can’t make it.
So that’s how this page picks one: by the week you actually have, not the week you’d have if nothing ever came up. It goes through the four arrangements you’ll meet and what each asks of a week, what the research says about dividing your training at all, what a missed session or a missed month really costs, and how to choose, including when changing would be worth it. If you can train three or four evenings most weeks, you’re a lot closer to a decision than the internet has made it look.
What a split is, and the four you’ll meet
A split, in gym language, is a way of dividing your body across the week, so that each workout trains part of it and the parts take turns. The alternative is to train everything every time, which is what a full-body plan does. Most people count full body as a split as well, and for choosing that’s the useful way to think about it: four ways of arranging the same week’s work, not three splits and an odd one out.
Here they are, each with what a normal week looks like on it. None of this is a program. Where we have the full version, I’ve linked it.
The “full body” plan
A full-body plan trains everything in every session, two or three times a week with a day off between. Monday, Wednesday and Friday is the classic. A session is a leg press or a squat, a chest press, a row, then whatever else the plan holds, and it’s done in about an hour. It gets sold as the beginner’s split and the busy person’s split, which undersells it, and I’ll come back to that. Our 3-day full-body workout plan is one: six exercises, a gym version and a home version.
The “upper lower” split
An upper lower split trains your upper body one day and your lower body the next, each of them twice a week: Monday upper, Tuesday lower, a day off, Thursday upper, Friday lower. An upper day is your presses and your rows, so chest, shoulders and back, with whatever you want to add for your arms. A lower day is a squat or a leg press, a Romanian deadlift, and the leg machines. Each muscle is trained twice a week, the days stay the same every week, and because each session covers half of you, it has room for more sets for each muscle than a full-body hour does, or it’s simply shorter. There’s a two-day version too, one upper day and one lower day, which is the smallest split there is.
The “push pull legs” split
A push pull legs split, PPL for short, sorts your exercises into three workouts by what your body is doing. Push day is your chest, the front of your shoulders and the back of your arms, so a chest press, a shoulder press and their smaller helpers. Pull day is the opposite: your back, your biceps and the back of your shoulders, so rows, pulldowns and curls. Leg day is everything below the waist. Each day is one team of muscles, so a push day has room for three or four exercises for your chest and shoulders where a full-body session holds one or two. On three days a week each muscle is trained once; on six, you go through the three workouts twice. On four or five days they rotate, so whichever workout is next in line is the one you do next time, and “Monday is push day” stops being true. Our push pull legs page has the whole thing: the days, the rotation, what the six-day version really adds, and who it suits.
The “body-part” split
A body-part split gives each muscle its own day: chest on Monday, back on Tuesday, legs on Wednesday, shoulders on Thursday, arms on Friday. Five sessions a week, each of them one or two muscles and a lot of sets for those muscles, and each muscle trained directly once a week. It’s the bodybuilding classic, the one the magazines ran for decades, and it’s still what a lot of people picture when they hear the word split. It also gets called the bro split, usually by people who have moved on from it.
Does the split change how much muscle you build?
Not by much, as long as the week’s work stays the same. This has been tested a lot, in people new to lifting and in people with years behind them. In 2024, researchers pooled 14 studies of 392 people in which a split was set against full-body training with the number of sets a week matched (a set is one run of reps without putting the weight down), and found the same strength gains and the same muscle growth either way. An analysis of 25 studies of how often a muscle is trained found no meaningful difference in growth between once a week and three or more times, again with the week’s work held equal. And the American College of Sports Medicine reached the same conclusion in its 2026 review of 137 reviews: training one day a week or more than five made no difference to muscle growth when the total work was equal.
That includes the body-part split, which gets the most grief online for training each muscle once a week. In one trial, 23 men who had lifted for about seven years trained for eight weeks either on a body-part split, each muscle once a week, or on a full-body routine five days a week, with the same sets a week in both, and gained the same strength and the same lean mass, which is mostly muscle. Two other small trials in trained men did find a little more growth in one or two muscles when those muscles were trained more often, and one found the opposite for the arms when the week’s work was packed into two long sessions instead of four short ones. So in experienced lifters the picture is untidy at the edges. On average, though, the arrangement isn’t where the difference comes from.
It’s also less “once a week” than it looks. Muscles work in teams. Chest day trains the back of your arms and the front of your shoulders as well, and back day trains your biceps, so on a body-part split most muscles get worked two or three times a week whether the plan says so or not. That’s part of why it works better than its critics expect.
Strength is a little different, because part of strength is skill. You get better, faster, at a lift you practice three times a week than at one you practice once. In the research, people who trained more often usually got stronger, but most of that came from doing more work in total, and when the work was matched the difference mostly went away, in beginners and in well-trained lifters alike. Our push pull legs page walks through this with a chest-press example, so I won’t repeat it here. The short version: the split decides how often you practice each lift, and practice counts for most in your first months, when most of the strength you gain is your nervous system learning the lifts.
So what is a split for, if it doesn’t build more muscle from the same work? Room for more work. Three things decide what your training builds: how many sets you do a week for each muscle, how hard those sets are, and how often each muscle gets trained. The first two do most of the work, and a split only touches the third directly. What it touches indirectly is the first. A full-body session that has to cover everything can hold only so many sets for any one muscle before it runs long or the last sets get sloppy. Divide the week, and each session has room for more sets for fewer muscles, done fresh. And more sets do build more muscle, up to a point: the College’s review found more growth with ten or more sets a muscle a week, each extra set adding less than the one before, until the curve has mostly flattened by around twenty. That’s the honest case for upper lower and push pull legs, and it’s a good one, once you want more from your week than three sessions can hold.
It’s also where the diminishing returns live, and I’d rather be straight with you about them than sell you a bigger week. Each extra hour in the gym buys less than the one before it, and at the start it buys very little, because at the start almost everything works. In the Finnish trial you’ll meet further down, people new to lifting trained their whole body twice a week for ten weeks, two exercises for each muscle, and the muscles they measured grew by about 17 percent. If you’re in your first month or two, five or six sessions a week probably buys you little extra muscle over three, and maybe a little strength from practicing the lifts more often. The extra days start to pay once three sessions no longer hold the work you want to do, and that’s usually months in, not week two.
What decides the result more than any of this is the list no split changes: sets that are actually hard, weights or reps that go up over the months, enough food and enough protein to build with, and enough sleep that the big lifts don’t fall off. With those in place, all four arrangements build muscle. Without them, none of them will rescue you, and neither will switching.
What the split actually changes
Three things, and none of them shows up in a study that matches the weekly work, because the study does the matching for you. In real life you do it, and the split decides how hard that is.
How long each session runs. The same week’s work can be two long sessions or four short ones. In a six-week trial, 18 men who had lifted for a few years did the same weekly sets either way: the two-session group was in the gym for about 105 minutes a time, the four-session group for about 45. Strength came out the same, and muscle about the same, with the long sessions slightly ahead for the arms in a group too small to make much of it. What differed was the shape of the week. Whether you’d rather make four trips of 45 minutes or two of an hour and three-quarters is a question about you, not about muscle, and it’s one the studies can’t answer for you.
How many days in a row you train. Full body wants a day off between sessions, because everything is sore at once. It works on back-to-back days too, in the one study that tested it, but a day between is easier to live with. Upper lower and push pull legs are built for consecutive days, and so is a body-part split, which is usually five in a row. The catch is that the days share more than the plan admits: your lower back works on rows one day and on deadlifts the next, and your shoulders work on both upper days. Not a reason to avoid them, but a reason to notice how those joints feel by Thursday.
What happens when you miss a day. This is the one nobody puts in the comparison table, and it’s the one that decides whether you’re still on the plan in March.
What each arrangement does with your week, and with a missed session
Plan | Days a week | Each session | If you miss one |
|---|---|---|---|
Full body | 2 or 3, with a day off between | Everything, about an hour | Nothing waits. Every muscle is trained again two or three days later. |
Upper lower | 4, two upper and two lower | Half of you, 45 minutes to an hour | Half of you waits for its next day, three or four days on. Or you slide the week along by one. |
Push pull legs | 3 with each workout once, or 6 with each twice; 4 or 5 in rotation | A third of you, about an hour | On six days, a third of you waits three days longer. On three days, it waits a week. In rotation, it’s simply next. |
Body-part split | 5 or 6, one or two muscles a day | One or two muscles, a lot of sets for them | That muscle waits a week, unless you shuffle the rest of the week to fit it in. |
Session lengths are typical, not fixed. Any arrangement can be made longer or shorter by adding or dropping exercises, and the last column assumes you don’t make the session up.
Read that last column with a real week in mind, not a perfect one. Judging a split by a perfect week is like testing your character’s gear and abilities on the training dummy in World of Warcraft, the target that stands still and never hits back. Everything looks great on the dummy. The fight is where you find out. Your fight is the week with the late shift in it, the friend who messages at eight to say they’re on, and the cold that takes out Wednesday.
On a full-body plan that week costs you almost nothing, because nothing is waiting on any one day. On upper lower and on six-day push pull legs, a missed day is a delay of a few days for part of you, which is fine, and easy to smooth over by doing the missed workout next and sliding the rest along. On a three-day push pull legs or a body-part split, a missed day is a missed week for a third or a fifth of your body, and the arithmetic doesn’t care that you had a good reason.
What a missed session actually costs
Less than the guilt suggests. One session is one of eight to twelve in a month, and no study has measured what a single one costs, partly because it couldn’t: one session’s worth of muscle is far below anything a scanner can see. What has been studied is what a stretch off costs, and how fast it comes back, and those numbers are the reassuring part of this page.
In 2024, researchers in Finland took 55 adults who didn’t lift, average age 32 and nearly half of them women, and put them on a full-body plan twice a week. One group trained for twenty weeks straight. The other trained for ten, stopped completely for ten, then trained ten more. In the ten weeks off, the second group lost some of what they’d built: about 5 percent off their leg press strength, about 4 percent off their biceps curl strength, and the trained muscles 7 to 10 percent smaller. Then, in their first five weeks back, they regained all of it, and by the end both groups had built the same strength and the same muscle. The researchers’ own conclusion was that people shouldn’t be too concerned about an occasional break of that length, as long as the training around it is regular and effective. Their break was planned, not an injury or a long illness, which they say their results don’t speak to. Still: ten weeks. Most missed stretches are one.
That matches the older study people usually quote, which found that six weeks on and three weeks off, repeated for six months, ended level with training every week, in fourteen young men on the bench press. And it fits what a review of 103 studies found about stopping altogether: strength does drop with time off, and the longer the break, the bigger the drop. Where the losses start to show, going by the studies that have looked, is somewhere around two to four weeks off.
You also don’t need the whole plan to keep what you’ve built. One study trained 70 adults three times a week for four months, then cut some of them to a single session a week, with one set per exercise, for the next eight months. The younger ones, aged 20 to 35, kept their muscle on that. Even the group that stopped entirely kept most of their strength for those eight months, with a small dip by the end. A review of this kind of study puts the floor at one session a week for holding on to strength and muscle in younger people, as long as the weights stay heavy. So a week where you only make it once isn’t a lost week. It’s a holding week.
Our muscle timeline page says the same thing from the other direction: two sessions a week still build muscle, and it’s the weeks with none that cost you. What the break research adds is that even those weeks cost you a delay, not a reset. Which puts the missed Tuesday in its place. It isn’t the missed Tuesday that ends people’s training. It’s the plan that turns a missed Tuesday into a lost week, and a lost week into two.
How to pick one
The program has to fit your life, not the other way round. When it’s the other way round, the odds that you keep it are poor. So, three questions, in this order, and the first one does most of the work.
How many days can you count on in a normal week? Not your best week. The normal one, with the late shift in it. If the honest answer is two or three, that answer has already chosen for you: full body, with a day off between. Four: upper lower fits four days like it was drawn for them, and three or four full-body sessions fit too. That’s the part the “beginner’s split” label misses: full body isn’t a stage you grow out of, and in the research it built as much muscle in experienced lifters as anything else did. Five or six: push pull legs, which is where a bigger week pays, in more sets for each muscle done fresh, or a body-part split if that’s the one you love. And if you have five free evenings but only need three, nothing says you have to fill them. In our coaching, someone new to lifting starts on two or three full-body sessions a week even with six evenings free, because what they need at the start is an amount of work they can manage and the same few lifts coming round often enough to learn them, not more days. If you’re new, set the bar a little low on purpose. A week you can beat is a week you’ll keep.
How long a session are you happy in? The same week’s work can be two long sessions or four short ones, as the 105-minute men found out. If an hour and a half in the gym makes you dread going, split the week further and keep each visit short. If getting there is the hard part and being there is fine, fewer, longer sessions cost you fewer trips. Neither is better for your muscles. One of them is better for your Tuesday.
Which one would you actually keep doing? This sounds soft, and it’s the hardest evidence on the page. In the trial that had women new to lifting train either two long full-body sessions or four shorter upper and lower ones a week, with the same work in both, the results were the same, and the only women who quit for lack of time were four in the four-day group. In a 2026 study that followed more than 100,000 beginners on a training app for a year, how many days they trained in their first month was the strongest sign of whether they were still training a year later, and the researchers’ advice to coaches was to help people settle into a weekly routine they can keep rather than an ambitious one they can’t. That is our position exactly, and was before the study: the best type of exercise is the one that gets done.
Pick in this order. Two or three days you can count on: full body. Four: upper lower, or full body again. Five or six, because you want them: push pull legs, or a body-part split if you love it and rarely miss. Then the session length you’ll tolerate, then the one you’d keep doing. If two of them fit, the one you’d enjoy more is the right answer.
One more thing about the body-part split, because I’ve been fair to it above and want to stay fair. It’s a perfectly good way to train if you enjoy it and your weeks are steady. Its two costs are the ones in the table: it doesn’t shrink below five days, and a missed day is a missed week for whatever muscle was on that day. If you can live with both, it will build muscle like the others. If your weeks change shape from one to the next, it’s the arrangement that punishes you most for it.
When changing your split is worth it
Not when someone on your feed changes theirs, and not because you’ve reached some level where full body is for beginners. The research above says the change itself builds nothing. Only what it lets you do differently can. So change when the arrangement is in the way:
Your sessions have grown too long. Exercises get added over the months, and an hour becomes ninety minutes. Splitting the week gives each session less to hold.
You want more work than your sessions can hold well. If the last sets of every session are sloppy because you’re spent, more days let you spread the same work out, and then add to it.
Your week has changed. A new job, a baby, a semester. Fewer days you can count on means fewer, fuller sessions, not the same split with holes in it.
You want to get stronger at a particular lift. Practice matters for strength, so a lift you care about wants to come round more often, which full body and upper lower do better than the others.
You’re bored. A real reason. Enjoyment is what keeps people training, and a new shape to the week is a cheap way to get some back.
Not a reason on its own: a stall in your log. Before you blame the arrangement, check the things that usually explain a stall, which are the sets, the effort, the food, the sleep and the number of sessions you actually did last month. Our muscle timeline page has that check. If those are all in place and the numbers still won’t move, then by all means change the shape of the week, and give the new one twelve weeks before you judge it. In our coaching we refresh a program at around twelve weeks, and that’s the moment to ask whether the arrangement still fits, not an automatic reason to add a day.
When you do change, keep the week’s work whole. Going from three full-body sessions to upper lower, each lift comes round twice instead of three times, so give it a set or two more each time. Going the other way, from six days to four or three, the sessions get longer or the smaller exercises go. The split is the container. The work is what you’re keeping. If you’d rather have a coach shape the week around your life and adjust it when your life changes, that is what we do at Gains For Gamers.
If you remember one line: don’t let the program pick how many days a week you train. You pick the program, by how many days a week you can train and keep training. Any of them builds muscle when the week goes to plan. Pick the one that still works when it doesn’t.
Questions we get asked
Is a 3-day split enough to build muscle?
Yes. Three days a week is where a lot of the research was done, and three full-body sessions train every muscle three times a week with more than enough work to grow on. Three days of push pull legs builds muscle too, since each muscle’s weekly work is what counts, but it trains each lift only once a week, which costs you practice, and a missed day costs that muscle two weeks. On three days, full body is the easier one to live with.
Is push pull legs better than upper lower?
Not for building muscle: with the same weekly work they come out the same. The practical difference is the days. Upper lower trains every muscle twice a week on four days, with the same days every week. Push pull legs needs six days to do that, or a rotation on four or five that moves across the weekdays. If you have four days, upper lower is the simpler fit. If you enjoy training most days, push pull legs is built for that.
Can I do full body four or five days a week?
You can. In an eight-week trial, men new to lifting trained their whole body four days a week with the same weekly sets as a split that trained each muscle twice, and grew the same, and five-day full-body routines have been tested in experienced lifters too. The trick is that each session has to hold less, so the week’s work stays sensible. Most people don’t need that many days to get there, and three with a day off between is the sweet spot for most people in our experience.
What if I can only train twice a week?
Then train twice, full body, with two or three days between. Two sessions a week trains every muscle twice, which is the floor the World Health Organization draws for adults, and in the twelve-week trial above, two long full-body sessions built the same strength and muscle as four shorter ones. Our 3-day full-body workout plan says how to run it on two days, and has a short session for the day you have no energy at all.
Next up
More on full-body training, one question at a time.
Learn
The 3-day full-body workout plan
Learn
Push pull legs: what it is, and who it's really for
Learn
How long does it take to build muscle?
Thanks for reading. I’m Daniel, and I wrote this. I’m a certified personal trainer with more than 10,000 hours on the gym floor with clients, and as founder and head coach of Gains For Gamers, I get to combine the best of my two favorite worlds: gaming and fitness.
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This page is general information from coaches, not medical advice. If you have a medical condition or an injury, or take medication, talk to your doctor before you change your training or diet.