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If body-part splits are supposedly worse than training each muscle twice a week, why is nearly everyone big in my gym doing them?

Worth naming the thing underneath your question, because it will keep coming back: on the internet, programme differences are discussed as though they are large, because a small difference is not an article.

The realistic gap between a good split and a slightly better one, run properly for a year, is small enough that sleep, protein and whether you missed six weeks in summer will each swamp it. That is not a reason to pick randomly. It is a reason not to spend another month reading instead of training.

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