You decided to start training. You searched for a program. Now you have five tabs open, each recommending a different workout split. Full body, push pull legs, upper/lower, bro split, something called PHUL. They all sound right. They all contradict each other.
For most beginners, it matters less than you think. But there are real differences, and some splits fit better depending on how often you can show up.
What is a workout split?
A workout split is how you divide your training across the week. Instead of doing everything every session, you organize exercises by muscle group or movement pattern. The split decides what you train on which day.
There are a handful of common approaches. None of them are wrong. But some make more sense for your schedule and experience level than others.
The main splits
Full body (3 days per week)
Every session trains every major muscle group: legs, chest, back, shoulders, arms, core. You do one or two exercises per area, keeping the workout around 45 to 60 minutes.
A typical week:
- Monday: Full body
- Wednesday: Full body
- Friday: Full body
You hit each muscle group three times per week. That frequency means more practice with each movement, which is what a beginner needs most. The sessions are balanced. If you miss a day, you have not skipped an entire body part for the week.
The downside is that each session covers a lot. You cannot do five different chest exercises in one day. If your goal is 90 minutes hammering one muscle group, this is not the split for that.
Upper / lower (4 days per week)
You alternate between upper body days (chest, back, shoulders, arms) and lower body days (quads, hamstrings, glutes, calves). Each area gets trained twice per week.
A typical week:
- Monday: Upper
- Tuesday: Lower
- Thursday: Upper
- Friday: Lower
More room per session for exercises targeting a specific area, while still hitting everything twice. A solid middle ground.
Four days is a bigger commitment though. If you can only make it three times a week, one half of your body gets trained less than the other, and the structure falls apart.
Push / pull / legs (3 to 6 days per week)
Exercises are grouped by movement type. Push days cover chest, shoulders, and triceps (the muscles that push weight away from you). Pull days are back and biceps. Leg days are everything below the waist.
The schedule is flexible. You can run the cycle once per week across three days, or repeat it twice for six. Most people land somewhere in between, doing four or five days and picking up where they left off.
A 6-day week:
- Monday: Push
- Tuesday: Pull
- Wednesday: Legs
- Thursday: Push
- Friday: Pull
- Saturday: Legs
A 4-day week might be:
- Monday: Push
- Tuesday: Pull
- Thursday: Legs
- Friday: Push
Then the following week starts with pull, and the cycle continues.
Related muscles are trained together, so you are not fatiguing your triceps on pull day and then asking them to work again on push day 24 hours later. At four or more days per week, each muscle group gets hit at least twice, which lines up with what the research recommends.
At six days it is a serious time commitment. At three, each muscle group only gets trained once per week, which is probably not enough to grow as fast as you could. The rotating schedule also means your days are not fixed, which can be harder to plan around.
Bro split (5 days per week)
Each day is dedicated to one muscle group. The classic version:
- Monday: Chest
- Tuesday: Back
- Wednesday: Shoulders
- Thursday: Arms
- Friday: Legs
You can do a lot of exercises for one area in a single session. Bodybuilders have used this approach for decades. It is simple to remember. Monday is chest day, period.
But each muscle only gets trained once per week. You are in the gym five days for the same number of muscle sessions that other splits achieve in three or four. And if you miss a day, that muscle goes two full weeks without training.
What the research says about training frequency
The practical difference between these splits comes down to how often each muscle gets trained per week. Researchers have studied this directly.
A 2016 meta-analysis by Brad Schoenfeld and colleagues looked at 10 studies comparing different training frequencies. Training a muscle group at least twice per week led to significantly more muscle growth than training it once per week. The effect held up across experience levels and protocols. (Schoenfeld, Ogborn & Krieger, 2016, Sports Medicine)
A 2018 review by Grgic and colleagues confirmed the same pattern. Two sessions per muscle group per week produced better results than one, assuming total training volume (sets and reps) was equal. Three times per week might be slightly better than two, but the difference was smaller and less consistent. (Grgic et al., 2018, Journal of Sports Sciences)
In practice, that looks like this:
- Full body 3x/week: each muscle trained 3 times. Right in the sweet spot.
- Upper/lower 4x/week: each muscle trained twice. Also in the sweet spot.
- PPL 4-6x/week: each muscle trained 1.5 to 2 times depending on how many days you run. Close enough.
- PPL 3x/week: each muscle trained once. Below what the research recommends.
- Bro split 5x/week: each muscle trained once. Same problem, more gym days.
The frequency advantage is real, but not massive. A well-run bro split still works. The difference over a year might be a few extra pounds of muscle with higher frequency. It adds up, but nobody should panic about their split being "wrong."
Total volume matters more than the split
A 2015 study by Schoenfeld and colleagues compared a full body routine (3 days per week) against a bro split (3 days per week), with the same total number of sets per muscle group each week. Both groups gained roughly the same amount of muscle. (Schoenfeld et al., 2015, Journal of Strength and Conditioning Research)
When volume is equal, the split matters less than people assume. The reason frequency helps in practice is that spreading your sets across more sessions tends to be easier to recover from and easier to sustain. There is nothing magical about hitting a muscle twice. It just makes fitting in enough total work more manageable.
The best split is whichever one helps you do enough work per muscle group each week and keep doing it consistently.
Which split should you pick?
Three days per week? Full body. You get the highest frequency per muscle group, the sessions are balanced, and missing a day does not leave a gap. Easiest split to follow consistently when you are new.
Four days? Upper/lower. Each session is more focused and you still hit everything twice. Good next step once three days starts feeling too easy or too rushed. Push/pull/legs works across four to six days if you want more variety and room to target specific areas, but it requires a bit more planning because the schedule rotates.
The bro split works if you enjoy it and you are consistent. But for a beginner who can only get to the gym three or four times, a full body or upper/lower split will give you more growth per session by hitting each muscle more often.
Plans break. That is normal.
Most of the debate around workout splits assumes you will follow the plan exactly as written, every week, for months. That almost never happens.
You travel for work and miss two days. The gym is packed and the squat rack is taken. You feel great one week and exhausted the next. Life shifts your schedule and suddenly your 4-day upper/lower becomes a 2-day whatever-is-available.
A rigid split works when conditions are perfect. When they are not, you need a plan that can adjust. That might mean rearranging exercises when equipment is busy, making up for a missed session by adding volume later in the week, or scaling back when recovery is low.
Once you have experience, the rules loosen up
Everything above is useful when you are starting out and need a structure. But the longer you train, the less any single split matters.
Experienced lifters often stop following a strict split altogether. They train what needs training on a given day based on how they feel and what they did recently. One week might look like upper/lower. The next might be push/pull/legs. The week after that might have two back sessions because the first one got cut short.
That is not random. You learn what your body responds to. How much volume you can recover from. What combinations work with your schedule. At some point the split becomes something you adapt rather than something you follow.
Some people blend approaches on purpose. A push/pull rotation for upper body combined with a dedicated leg day. Others use a loose full body structure but add extra volume on weak points. There is no name for this. It is just training that fits the person instead of the other way around.
You get there by spending time under a structured program first. That is what builds the intuition for how your body responds, what recovery feels like, how volume adds up across a week. Once you have that, rearrange however you want.
The takeaway
Pick a split that matches how many days you can realistically train. Three days, go full body. Four, try upper/lower. More than that, push/pull/legs gives you room to grow. The research says frequency and total volume matter more than how you organize your days.
Then pay attention to what actually happens week to week. A program on paper is a starting point. What you do with it over time is the actual program.
If you want something that handles this for you, picks exercises based on your schedule, tracks what you do, and adjusts the next session when things go off-plan, that is what maatriks does. But the principles above work regardless. Start with a split that fits your life and give it enough time to work.
Studies referenced
- 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;46(11):1689-1697.
- Grgic J, Schoenfeld BJ, Davies TB, Lazinica B, Krieger JW, Pedisic Z. Effect of Resistance Training Frequency on Gains in Muscular Strength: A Systematic Review and Meta-Analysis. Journal of Sports Sciences. 2018;36(14):1567-1578.
- 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;29(7):1821-1829.