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I didn't know you could get a phd in "consciousness studies". You understand of course there are those here that can have a field day with that info .

Ya, but with his PHD, he can talk the talk and with 25 years of martial arts behind him, he's proficient in "unconsciousness studies" ;D

Hopefully we've enlightened some and encouraged others.
If you look at the links, you see that these are degreed Professionals in their field of expertise who are making these statements, I don't see there's much room for disagreement. It's not an idea that opinion based, it's based on studies of the human body. I guess you can choose not to believe the experts but why would you :-?

If your into exercising or even if your not and don't breath primarily thru your nose, give it a try and see for yourselves. You have nothing to lose, and maybe something to gain ;)