Full body or a split: which should you do?

The evidence-led answer

NST verdict

Full-body and split routines can both be workable ways to organise resistance training. The larger frequency review found no clear muscle-growth advantage from training more often when weekly volume was matched [Schoenfeld 2019]. That does not establish that every routine produces identical results, and it does not make twice-weekly training a universal minimum. Choose a schedule you can follow and use it to distribute manageable training work. Full-body sessions may suit fewer weekly visits; a split may suit someone who prefers shorter sessions across more days. Those are practical options, not evidence-established requirements.

Does full body versus split change your results?

The 25-study review published in 2019 found no clear hypertrophy advantage from higher frequency when weekly volume was matched. The two direct trials cited in this draft did not identify clear between-group differences in their measured outcomes, but they were small and short. These results support flexible scheduling, not proof that every programme is equivalent.

Is there any frequency guidance that does matter?

The evidence does not justify a universal twice-weekly rule. The smaller 2016 review favoured twice over once weekly for muscle growth. The later 25-study review found no clear frequency effect when volume was matched [Schoenfeld 2016; Schoenfeld 2019]. The earlier result should be presented alongside the later evidence, not treated as an exception that automatically survives it. Spreading work over multiple days may make a routine easier to manage. That is a scheduling consideration, not proof that training a muscle once weekly cannot work or is always inferior. Muscle growth and maximal strength are separate outcomes; do not extend a hypertrophy finding into a claim about every strength goal.

So how should you choose?

On practical grounds, because the training result is roughly the same either way.

Full body, two to three times a week, is the efficient default. Every session touches every muscle, so if life gets in the way and you only manage two of three planned sessions, you have still trained everything. It keeps the number of gym trips low. The downside is that sessions can get long, and doing squats, presses and pulls in the same workout is tiring.

A split, upper lower, or push pull legs, makes sense when you can reliably train four to six days a week, want to do more exercises per muscle in a session, or find full body sessions draining. Spreading the same weekly volume across more sessions also lowers how hard each one feels: in the trained men trial, full body squat sessions carried a higher rating of perceived exertion than the split version. The downside is that missing one session of a split leaves a muscle group short for the week.

What this means in practice

Choose a structure that fits your week. Two or three full-body sessions, or an upper/lower split across four days, are examples rather than prescriptions. Other schedules can be workable. Consider session length, the amount of work you can perform with controlled technique, recovery between sessions and whether you can keep following the plan. Adjust if the schedule is not manageable. You do not have to train each muscle twice weekly simply to satisfy a rule in this article.