Circular Breathing

Um, I don't know whether or not it's actually possible. Sceloporus, it's when you breath in through your nose, while simultaneously breathing out with your mouth so the air circulates like that.

I've heard of people who play the digeridoo, and apparently they can do it. It's funny, a lot of aboriginals used to do it to pass breathalyser tests lol, until the cops found out and started holding their noses lol

Good luck
 
It sounds near impossible, the the muscles under your lungs can either expand or contract your lungs at any given time.This doesn't seem plausible but maybe there is some weird technique to it.
 
Haven't really a clue how it's done but you might hit google for related info on wind instruments and throat singing.