What changed this week, and what to do about it.

New studies, wearable releases and race weeks, each written for the question you type after the headline. Three lines on top: what happened, what the evidence says, what to change. Source and DOI on every item, verified before it goes up. Older items get a status line so the log stays honest.

Nothing published yet. The radar runs every morning; the first items land here as soon as they pass the fact-check.