May seem like a dumb question, but what's the best way to breathe during high output exercise? Long full breaths, deep quick breaths, in through the mouth and out through the nose? I'm thinking there's some science behind it, namely the most efficiecnt way to exchange CO2 for O2, and I find that forcing myself to consciously breathe rather than breathe autonomicaly has improved benefits, but what works the best, as far as the exercise physiologists are concerned?