An unexpected gesture of gratitude could make someone's day. Think about it, if you did something insignificant or routine for someone without expecting a response, and you received thanks from them? You'd probably feel good, and the entire morale of any group or relationship would instantly level up, even if only subconsciously or momentarily.
Getting to know your breathing on a regular basis is like becoming friends with your lungs. This will feel strange at first, as would any new relationship - so much to learn! So many apprehensions, ”Will we get along or even have anything in common? Maybe it's best just to do our own things and not get too involved with each other.” Try starting with this: “Hey thanks for doing all that with the oxygen and keeping me alive and all.. How’s that going?”