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Search "4 day workout split reddit" and you will usually see the same question in different forms: which split is simple enough to stick with, but smart enough to keep you progressing? The honest answer is that there is no single perfect layout. The best four-day plan is the one you can recover from, repeat, and actually enjoy long enough to see results.

Why 4-day splits keep showing up on Reddit

The reason these splits come up so often is that the research does not reward magic labels. ACSM guidance points to training major muscle groups 2 to 3 days per week with about 48 hours of recovery between sessions for the same muscles, and a meta-analysis found that when volume is matched, training frequency does not meaningfully change hypertrophy. That means a 4-day split is mainly a way to distribute weekly work in a way you can recover from and repeat. If you want more general training ideas, Setgraph's Fitness & Workout Tips and Core Principles & Techniques for Every Lifter pages are useful companions. (pmc.ncbi.nlm.nih.gov)

1. Upper/Lower Split

Best for beginners and intermediates, the classic upper/lower split is still the easiest answer to a 4 day workout split reddit thread. You train the upper body twice and the lower body twice, which gives you enough frequency to practice the main lifts without turning any one session into a giant grind. A simple week looks like upper on Monday, lower on Tuesday, rest on Wednesday, upper on Thursday, and lower on Friday.

The big advantage is balance. You can keep bench, rows, squats, hinges, and single-leg work in the same weekly cycle, then add accessories where you need them most. That makes it easy to progress slowly and objectively instead of changing the program every week. If you want a step-by-step template for building sessions, the Setgraph Training Guide is a practical place to start. A solid upper/lower plan lines up well with common recommendations to hit each major muscle group multiple times per week, and it keeps session length manageable for most lifters. (pmc.ncbi.nlm.nih.gov)

2. Upper/Lower A/B Split

This is the cleaner version of upper/lower if you want strength and size at the same time. Instead of repeating the same two workouts, you run an A day and a B day for both upper and lower. For example, Upper A can start with bench press and a heavy row, while Upper B uses incline pressing, pull-ups, and more shoulder work. Lower A can lean toward squats, while Lower B focuses more on hinges, leg press, or unilateral work.

The benefit is fatigue management. Your heavy lifts get the freshest attention, while the second version of each day can carry more volume and slightly lighter loading. That makes the split useful if you want to improve your main lifts without losing the muscle-building work that usually follows them. For more ways to balance intensity and recovery, see Optimize Your Training. Research comparing two and three days per week in trained men found similar increases in strength and muscle size when volume was controlled, so this kind of split is really about how you distribute work, not about chasing a magical frequency number. (pubmed.ncbi.nlm.nih.gov)

3. Push, Pull, Legs Plus Upper

This is the compromise split you see a lot when someone likes PPL but only has four training days. A common layout is push, pull, legs, upper, which gives the torso an extra session without requiring a five-day schedule. It is especially useful if your upper body is the priority, or if you want to give legs one dedicated day and let the other sessions focus on chest, back, shoulders, and arms.

The appeal is simple. You still get the familiar PPL structure, but you do not force yourself into a full six-day routine just to make it work. On the upper day, you can repeat your best pressing and pulling patterns, then use the extra time for weak points. It is a very practical choice for people who like the PPL feel but need a schedule that fits real life. Since frequency choice can be made largely on preference when weekly volume is matched, this setup is more about convenience than a hidden growth advantage. (pubmed.ncbi.nlm.nih.gov)

4. Full-Body A/B Rotation

A full-body A/B plan looks less like the typical Reddit split, but it works very well if you want flexibility. You alternate two full-body workouts across four days, often A, B, A, B, with each session built around one squat pattern, one press, one pull, and a few accessories. That lets you spread the weekly workload across the whole week instead of concentrating it into one body part per day.

This can be a strong choice for busy people, returning lifters, or anyone who likes shorter workouts. Because the same movement patterns show up often, you get more practice with the lifts and fewer ultra-long sessions. The frequency research backs up the idea that training a muscle more often is fine as long as the weekly work is controlled, and when volume is equal, frequency itself is not the main driver of growth. If you want a simple training note system for this style, a digital logbook becomes especially useful. (pubmed.ncbi.nlm.nih.gov)

5. Powerbuilding Split

Powerbuilding is the best label for lifters who want to keep strength numbers moving while still chasing visible muscle. A four-day version usually starts with one or two big lifts, then moves into higher-rep accessories for the muscles that need more work. You might squat and bench early in the week, then follow with rows, hamstrings, shoulders, and arms later on.

What makes it work is that it gives priority to the lifts that matter most to you. If your goal is to add weight to the bar, powerbuilding keeps those compounds front and center. If your goal is to look more muscular, the accessory work fills in the gaps. The only real drawback is fatigue, because heavy lifting plus a lot of extra volume can run you into the ground if you are not paying attention to recovery. Keep the main lifts stable for several weeks before deciding whether the split is helping or just feeling hard.

6. Body-Part Split

The classic chest day, back day, leg day, shoulder day version is the one people either love or outgrow quickly. It can absolutely work, especially if you are advanced, know your recovery, and are good at packing enough quality volume into one session. It also gives you that old-school gym feel, which is part of why it still has a place in many 4 day workout split reddit discussions.

The catch is that body-part splits are more about preference than superiority. A recent meta-analysis found no meaningful hypertrophy difference when training frequency was compared on a volume-equated basis, which means hitting a muscle once per week is not automatically worse or better than spreading the work out. If you enjoy longer sessions and want to fully focus on one area at a time, this is a valid route. If you hate long workouts or tend to lose steam halfway through, it will probably feel inefficient fast. (pubmed.ncbi.nlm.nih.gov)

7. Upper/Lower With a Weak-Point Day

A weak-point day is the simplest upgrade if your basic split is already working. Keep the two upper and two lower sessions, then use the final day for whatever lags behind, such as delts, arms, calves, hamstrings, or upper back. That gives you targeted extra work without forcing your whole week into a five-day plan.

This option is especially useful when one area refuses to catch up. Instead of bloating every session with extra work, you can put your spare effort into one focused day and keep the rest of the week clean. It is also easier to recover from than trying to make each workout do everything. Think of it as controlled specialization, not random junk volume. If your plan already covers the basics, this is often the most practical way to push one or two weak links forward.

How to choose the right one

Based on the evidence above, the smartest choice is an inference, not a rule. The same review notes ACSM guidance of 2 to 3 days per week with 48 hours between sessions for the same muscles, while NSCA guidance scales up with experience, from 2 to 3 days for beginners to 4 to 7 for advanced lifters. Pair that with the meta-analysis showing no meaningful hypertrophy difference when volume is equated, and the practical answer becomes clear: pick the split that lets you recover and stay consistent. (pmc.ncbi.nlm.nih.gov)

Use this quick filter:

• Choose upper/lower if you want the simplest, most balanced option.

• Choose upper/lower A/B or powerbuilding if strength and size are both priorities.

• Choose push/pull/legs plus upper if your upper body is the main focus.

• Choose full-body A/B if your schedule changes often and you want shorter sessions.

• Choose body-part split or a weak-point day if you are more advanced and know how to manage fatigue.

If you want a broader library of ideas to compare against your own setup, the Setgraph App Reviews (2025): User Ratings for Tracking Sets, Reps & Workouts page is a helpful place to start.

How to make any 4-day split work

The best split still fails if you change it every week, so give any new plan at least four to six weeks before judging it. Keep your main lifts mostly stable, track your sets and reps, and change one variable at a time. That makes it much easier to see whether the program is actually working or whether you just needed more sleep, better food, or a smaller jump in load.

A simple rule set helps more than a fancy template:

• Keep the first one or two exercises on each day consistent.

• Add reps before adding weight when the movement is still new.

• Use accessories to support the main lifts, not to bury you in junk volume.

• Write down what you did, then compare it to last week.

If you like keeping a digital logbook, pairing your plan with a workout tracker gym log app is an easy way to reduce guesswork.

The bottom line

If you came here looking for the one perfect answer to the 4 day workout split reddit debate, the boring truth is that upper/lower wins for most people, A/B variations help lifters who want more structure, and PPL plus upper or a weak-point day can make the week fit your priorities better. The best split is the one you can repeat long enough for progress to show up. (pubmed.ncbi.nlm.nih.gov)

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