3 ms·

QQ, when I go running or exercising hard, I always end up mouth breathing. Is it harmful in this context?

• algoatecorn 4y ago
  No. Almost everyone will need to mouth breath while at max effort. It may be beneficial to deliberately nose-breath as long as possible, especially at Zone2. I try to transition to nose-in, mouth-out as a fallback before going mouth-in, mouth-out. Honestly, I don't even know how big of an effect it has, but I've been trying it for the past year to test it out. Been training for over a decade so I just enjoy testing new things.
• tgv 4y ago
  It's (also) a matter of capacity. You need to inhale a lot of air during exercise. Your nose is just too narrow.