Andrew Huberman· PhD
That is as you get more and more fit, you'll have to move faster and or bring more weight in order to stay in zone two and that will simply tell you that you are indeed improving your endurance.
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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.
That is as you get more and more fit, you'll have to move faster and or bring more weight in order to stay in zone two and that will simply tell you that you are indeed improving your endurance.
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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.
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And then as you build up fitness, you can add time or you can add weight through a weight vest, or if you don't want to buy a weight vest or can't afford one, there's a simple solution to that, I actually have a good anecdote about that.