Tim Ferriss Blog: The Painless Path to Endurance.
Nose breathing, as opposed to hauling in lungfuls through the mouth, has been one of my training techniques for years. Learned it from a 1980 book by Benny ‘The Jet’ Urquidez, Training and Fighting Skills, back when I was practicing iai-do (the rather esoteric art of Japanese sword-drawing). Breathing through the nose keeps your heart from overworking - reinforcing the fact that our natural physiological systems are self-protective when used properly. [Tim Ferriss, if you happen to see this post, check out Benny’s book.]
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