A split is just a way to distribute exercises across the week. It does not create growth by itself. When weekly volume is equated, research does not show a meaningful advantage of split routines over full-body routines for strength or hypertrophy.
That makes schedule fit the deciding factor. The best split lets you train the target muscles often enough, keeps sessions manageable, and survives the weeks when life is less organized than your spreadsheet.
The short version
- Weekly work and execution matter more than the split's name.
- Full-body plans are efficient for two or three weekly sessions.
- PPL usually makes more sense at higher weekly frequencies than at three days.
Full body: resilient and frequency-friendly
A full-body plan can train each major muscle two or three times per week without many gym days. Missing one session still leaves other exposures in the week. The tradeoff is that each day needs careful exercise order and fatigue management.
This format suits beginners, busy lifters, and anyone who prefers more frequent practice of the main movements.
Upper/lower: a clean four-day default
Upper/lower splits commonly place two upper and two lower sessions across the week. They offer room for multiple exercises per region without making every session very long. Recovery days are easy to arrange.
The main downside is that lower sessions can become dense if you try to train quads, hamstrings, glutes, calves, and heavy compounds with equal priority each time.
Push/pull/legs: flexible at higher frequency
PPL groups pressing muscles, pulling muscles, and legs. At six sessions per week, each pattern can appear twice. At three sessions, each muscle may only receive one direct weekly exposure unless the rotation continues independently of the calendar.
PPL is attractive because the categories are intuitive. It is not automatically superior, and a six-day schedule is only useful if you can repeat it.
Choose using your real calendar
Start with the number of sessions you can protect most weeks, then distribute weekly work. Two or three days often favors full body; four often fits upper/lower; five or six allows several hybrids and PPL variants. Enjoyment and equipment also matter because adherence is part of program design.
Sources & further reading
Community discussions informed the questions; health and training claims are grounded in the professional guidance and research listed here.