Moderate evidence

Structured variation in training over time gives a small strength advantage over keeping everything constant.

In practice

Worth something, but far less than showing up and adding weight when you earn it. Elaborate periodisation is not what stands between most people and progress.

What it doesn't say

The comparison is contested — critics argue the periodised groups often did more total work, which would explain the difference without periodisation itself doing anything.

Source

• Williams TD, Tolusso DV, Fedewa MV, Esco MR (2017). Comparison of periodized and non-periodized resistance training on maximal strength: a meta-analysis. Sports Medicine, 47(10):2083–2100. doi.org/10.1007/s40279-017-0734-y