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.
So, you know, I'm not associated with this at all, but World Fitness Calculator is, it's a valid calculator for estimating VO2 max. And so what I mean by that is it's based largely on a lot of research that's been conducted in Norway, in particular Norwegian Technological University.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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And so the bottom line is they have a lot of data on measuring things and seeing how they correlate or are related to, or can predict VO2 max. And so of all of the calculators that are out there, I think this is the one that people could trust the most in terms of answering a few questions about their age, their sex, their typical activity levels, and it will give them a reasonable estimate of their VO2 max.