Thanks a lot for the link. Wouldn't have noticed how bad my breathing is otherwise... !
It's crazy how stress can affect a body. I really have to get back to doing yoga. Never felt as healthy and good as when I did yoga.
Trained singers and some instrumentalists (those that require wind, i.e. not violinists) will already be very aware of this difference - using your diaphragm to breathe is emphasized early and often during lessons. I can recall my 7th grade choir teacher having a new kid in choir lay down on the floor to practice his breathing. It turns out it's quite a bit easier to breathe deeply with your diaphragm when laying on your back. You notice it almost immediately but it takes time to get used to doing it while standing up.
I didn't really stick with the class after finding some flaws with it but I learned some stuff in the long run, and the breathing thing has stuck with me after feeling it's effects.
This was my instructor, dude had a pain threshold that was unbelievable. You can see him using the techniques while being... abused.
I couldn't help find it humorous that it's harder to determine the answer when my left hand starts in a position that's significantly higher than my right hand.
Anyway, long term catastrophe averted.
here's an article on how to do it.