Warning: DO NOT ATTEMPT TO BREATHE IN A MANNER THAT YOU ARE UNACCUSTOMED TO WHILE OPERATING HEAVY MACHINERY OR DOING ANYTHING POTENTIALLY DANGEROUS!
You may get dizzy or even black out momentarily!
I recommend paying close attention to what is beneath you as well, and not walking down the sidewalk the first few times, you will probably get light headed if you’re doing it right. Sitting upright in a soft chair is probably a good idea.

Yes, we all breathe already, and all assume we are doing a fine job of it. However, I went over 30 years before I learned how to do it correctly. I had heard the insult "mouth breather" before, but didn’t understand... I have always been (honestly) among the smartest people I’ve known, and I used my mouth, you have to in order to speak, and martial arts teach to breathe in through the nose, out through the mouth.

WRONG!!! Bad mouth-breathing tailless monkey!