The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
But I think when you look at the literature carefully, most of the positive effects of regular cardiovascular exercise on brain function, working memory, declarative memory, focus ability, and a number of other things occur because you're getting excellent glymphatic clearance during sleep, and you're getting just more clearance of waste products even in wakefulness.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
But in addition to that, exercise has direct effects on increasing the amount of glymphatic clearance that occurs in those perivascular spaces of the brain while you sleep.