Breathe with your diaphragm, not your chest, and notice the change in mind state

Puffing your chest and breathing with it puts you in kind of 'fight or flight' mode. Yet they teach us this. Just watch a baby breathe, they haven't learned yet.

You will likely need to work up to it, it is muscle and needs work. I almost never notice anyone breathing this way.

Breathing with the diaphragm also aids in digestion