James Nestor is the journalist-author whose New York Times bestseller Breath turned nasal breathing from a niche performance hack into a mainstream conversation. His Stanford 10-day mouth-breathing experiment — and the immediate spikes in blood pressure and snoring that followed switching pathways — gave the protocol the kind of headline data that makes coaches actually try it. For cyclists trying to extract the last 1–2% of aerobic efficiency, his work matters because it documents that the breath itself, not the legs, is often the limiting factor at submaximal intensity.
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Where Nestor lands on the questions people ask most.