henry copeland:
“Almost everybody breathes nasally at rest,” he continues. “As you start to do light exercise, you’ll continue to breathe through the nose entirely until you’re at about two to three times your resting breathing rate.” At that point, you’ll start breathing through your mouth. And once you exceed four to six times your resting breathing rate—taking in 20 to 35 liters of air per minute—“everyone in the world is a mouth breather,” Shaffrath says. “You can’t push 21 liters of air through your nose comfortably.”
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- www.outsideonline.com