Hi viv;...sorry if I did not make my point clear,but when I refer to breathing I dont mean that the act of breathing is the spirit but is used in terms of taking breath (air oxygen)which is the bodies way of staying alive by using the force of the air in our lungs.
Similarly in Chinese spirit ' qi 'or ' chi ' is literally breath , air, gas.
I did not intend it as contradictory as you have seen it.
So to summarize, spirit is a word used in language with multiple meanings . Sometimes used to mean supernatural beings or influence, I disagree with that.
Sometimes as a descriptive to denote human traits attitudes etc, as you have alluded to, I understand that definition.
Sometimes used to mean in human context the physical air we breath allowing us the force of breathing to keep us alive, I would concur with that although until you asked the initial question its not a description of spirit that i had thought about, and now i will forget about it.
Best wishes