There is no single best training split for hypertrophy. A systematic review and meta-analysis published in the Journal of Strength and Conditioning Research found virtually identical muscle growth across split routines and full-body routines when total weekly volume was the same. The differences in arm size, leg size, and lean body mass between the two approaches were statistically zero. What actually drives muscle growth is your total weekly volume, not how you distribute it across the week.
That said, some splits make it easier to accumulate enough volume, recover properly, and stay consistent. Here’s how the most popular options compare so you can pick the one that fits your schedule and preferences.
Weekly Volume Matters More Than Frequency
The most reliable predictor of muscle growth is the number of hard sets you perform per muscle group each week. A systematic review of training volume research found that 12 to 20 weekly sets per muscle group is the optimal range for trained individuals looking to maximize hypertrophy. Fewer than 12 sets still produces growth, but the returns are smaller. Going above 20 sets may offer diminishing or no additional benefit, and it raises the risk of accumulating too much fatigue.
Once you know your volume target, the split you choose is simply a way to organize those sets across the week. A study comparing two sessions per week against four sessions per week, with identical total volume, found no difference in lean mass gains, muscle thickness, or strength after nine weeks. Multiple meta-analyses have reached the same conclusion: when volume is equated, frequency has a limited role.
Why Hitting a Muscle Twice Per Week Is Practical
Even though frequency itself doesn’t appear to be the growth driver, training each muscle at least twice per week has a practical advantage. After a hard resistance training session, muscle protein synthesis (the process your body uses to repair and build new muscle tissue) spikes to more than double its resting rate within 24 hours. By 36 hours, it’s already back near baseline. If you only train a muscle once per week, you get one burst of that elevated rebuilding signal and then five or six days where the muscle is essentially idle.
Training a muscle twice per week gives you two of those growth windows. It also lets you spread your weekly sets across more sessions, so each individual workout is less grueling. Doing 8 sets for chest in one session is more manageable than cramming 16 sets into a single day, and the quality of your later sets tends to be higher when you’re less fatigued.
Push/Pull/Legs (PPL)
The push/pull/legs split groups muscles by movement pattern. Push days cover chest, shoulders, and triceps. Pull days cover back and biceps. Leg days cover quads, hamstrings, glutes, and calves. Because related muscles are trained together, you get maximum overlap of compound movements within a session. Bench pressing, for instance, trains your chest, front delts, and triceps in one motion, and all three of those muscles get additional isolation work in the same workout.
The tradeoff is that PPL needs enough weekly sessions to hit each muscle group more than once. Running it three days a week means each muscle is trained only once every seven days. Running it six days a week (push, pull, legs, push, pull, legs) hits everything twice and is probably the most popular hypertrophy split among intermediate and advanced lifters. A five-day rotating cycle, where you train two days on, one off, one on, one off, hits each muscle roughly every five days and works well for people who find six consecutive training days too demanding.
PPL is a strong choice if you can commit to at least five sessions per week. If you can only train three or four days, other splits distribute volume more efficiently.
Upper/Lower Split
An upper/lower split divides training into two session types: one for everything above the waist, one for everything below. A typical layout runs four days per week (upper Monday, lower Tuesday, rest Wednesday, upper Thursday, lower Friday, weekend off). Each muscle group gets trained twice, and you have built-in recovery because your lower body rests during upper sessions and vice versa.
The limitation is session density. Because you’re covering your entire upper body or entire lower body in one workout, you typically perform only one or two exercises per muscle group per session. That’s usually enough to reach the 12 to 20 weekly set target when you’re training four days, but if you need higher volumes for a lagging muscle group, it can make individual sessions long. Upper days especially can feel packed when you’re trying to adequately train chest, back, shoulders, biceps, and triceps in a single session.
Upper/lower is one of the best options for people who train four days per week. It’s simple to program, easy to progress, and naturally balances training stimulus with recovery.
Full-Body Training
A full-body routine trains every major muscle group in each session, typically three days per week with a rest day between sessions. The meta-analysis data shows it produces the same muscle growth and strength gains as split routines when volume is matched. For someone training three days a week, full-body is more efficient than a three-day PPL because it hits each muscle three times instead of once.
The challenge is managing fatigue within each session. When you’re squatting, pressing, rowing, and deadlifting all in one workout, the exercises you do later in the session suffer from accumulated tiredness. One way around this is rotating exercise order: start with legs on Monday, chest on Wednesday, and back on Friday. Full-body training also works well for beginners who don’t yet need high volumes per muscle group. If you only need 9 to 12 sets per muscle per week, three sets per muscle across three sessions is straightforward and effective.
The Traditional Body Part Split
The classic “bro split” dedicates an entire session to a single muscle group: chest Monday, back Tuesday, shoulders Wednesday, legs Thursday, arms Friday. It’s been a gym staple for decades, and it does work. But it hits each muscle only once per week, which means you get just one spike in muscle protein synthesis per muscle every seven days.
Where the body part split shines is in accommodating very high volumes. If you’re an advanced lifter who needs 20 or more sets per week for a muscle group, doing all those sets in one dedicated session can feel more focused than scattering them across multiple days. The research shows this approach produces equivalent growth to higher-frequency plans as long as the total weekly sets are the same. It’s not inferior, just less efficient for most people’s schedules and recovery capacity.
How to Choose Your Split
Your best split is the one that lets you consistently hit 12 to 20 hard sets per muscle group per week, recover between sessions, and show up regularly. Here’s a practical guide based on how many days you can train:
- 3 days per week: Full-body training. Each muscle gets trained three times, and you can reach adequate volume with modest set counts per session.
- 4 days per week: Upper/lower split. Two upper and two lower sessions per week, each muscle trained twice, with a clean recovery structure.
- 5 days per week: Push/pull/legs on a rotating schedule, or an upper/lower split with a fifth session dedicated to weak points.
- 6 days per week: Push/pull/legs done twice through. This is the most popular high-frequency hypertrophy setup and allows plenty of volume with manageable session lengths.
Managing Fatigue Across the Week
More training sessions mean more opportunities for growth, but also more accumulated fatigue. Prolonged central nervous system fatigue can lead to poor sleep, reduced motivation, difficulty concentrating, and a general feeling of lethargy. These aren’t just discomforts. They signal that your brain is losing the ability to fully recruit motor units, which directly reduces the quality of your training.
At the peripheral level, metabolic byproducts build up in your muscles when you train at high intensities repeatedly without sufficient rest. This accumulation can reduce the force your muscles produce during contractions, making your sets less effective even when you feel mentally ready to train. If you notice that your performance is declining across the week, your sleep quality is dropping, or you’re consistently sore going into sessions, those are signs you need more rest days or a reduction in weekly volume. A well-designed split should leave you feeling recovered enough to push hard in each session, not just surviving your way through the week.