Nasal-only breathing during exercise

Nose-only breathing cuts your peak oxygen uptake and your top workload, and raises how hard the same effort feels.

Who it's forAny man who's taped his mouth or been told to breathe through his nose on every run.

Emergency: call 911.

I am not a doctor. This is not medical advice. This is self-education. Talk to a physician who has your history before you change anything.