Breathe through your nose

The last body letter of the third month returns to the breath, with a measurement and a rule.

In 2015 an Irish breathing teacher named Patrick McKeown, who'd been a chronic mouth-breather with asthma until he found the Buteyko method, published The Oxygen Advantage, a book that brought reduced breathing into sport. In 2020 a journalist named James Nestor spent a month with his nose plugged, breathing only through his mouth, measured the damage, and wrote Breath, which made the case to millions: the nose is the organ of breathing, the mouth is for eating, and we've forgotten.

The science is older than both. In 1976 a Stanford physician named Christian Guilleminault described sleep apnea, the stopping of breath during sleep that was going undiagnosed in millions, and built the screen for it. Loud snoring, gasping, daytime exhaustion, waking with a dry mouth: those are signs, and they're a doctor's door, because untreated apnea damages the heart and the brain.

The practice is three words from McKeown: light, slow, deep. Breathe through the nose, always, awake and asleep. Breathe less, not more. Let the breath drop low into the belly. His measurement is the BOLT score: after a normal exhale, how many seconds until the first urge to breathe. Under ten is poor; twenty is average; forty is the goal. It's the Control Pause from day fifty-two, pointed at athletes. His training is breath holds, walking with the breath held, nasal-only running, to raise the body's tolerance for carbon dioxide and, with it, the efficiency of every breath.

A chamber about attention ends on the one thing you do twenty thousand times a day without noticing. Notice it. Close your mouth.