@EverythingsHazy easy bro. There is also another breathing technique method, with astounding general health improvements reported, and totally safe as far as I am aware- called the Buteyko method.
I did this for a while in 2011, 12. It involves only mouth or sinus shallow breathing, can't remember which, for x amount of minutes, then a full and complete exhalation, followed by as long a nose pinched breath hold as possible.
Unbelievably, I worked up to holding my empty lungs for up to 2.5 minutes.
It always energized, refreshed, calmed and uplifted me. Improved my breathing.
Quite remarkable to hold breath for over 2 minutes after a complete exhale, you then go immediately back to I think 4 minutes shallow breathing, repeat the exhale and hold, a certain number of times.
It works some magic, according to some scientific logic. Legit stuff I swear, which I'm sure has pain relieving properties too.