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thevoxfitness 4d Push/pull splits vs full body for hypertrophy is downstream of the frequency question that Schoenfeld 2016 settled. The meta-analysis was on training frequency, not specific split design. The frequency principle: 2x/week per muscle group beats 1x/week at equal weekly volume. Applied to split design for someone training 3 days/week: - Traditional bro split (chest day, back day, leg day): each muscle hit 1x/week. Suboptimal per Schoenfeld.  1 / 4 3 1

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Two meta-analyses on the same question came to opposite conclusions: one found 2x/week beats 1x/week for hypertrophy, the other found no difference when volume is equal. The frequency debate isn't settled—it's a draw.

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Scientific verdict1 claim checked

There's disagreement

Studies point in different directions — there's no clear consensus yet.

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The breakdown

The claim that training twice a week is better for muscle growth is not as settled as this post suggests.

The post points to a specific study, but other research tells a more complicated story. One large analysis found that working a muscle twice a week builds more muscle than once a week, as long as total volume is equal. However, another analysis found that when total weekly volume is matched, frequency doesn't matter—muscle gains are the same whether you train a muscle once or twice a week. So the evidence is actually split, with different meta-analyses coming to opposite conclusions.

Bottom line

So while hitting each muscle twice a week might work for you, the science isn't unanimous—some studies show no benefit over once a week, so it's not a hard and fast rule.

ReliabilityThe evidence is mixed — some research supports it, some contradicts it.
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