Viv ...I said the act of breathing is NOT SPIRIT you misread.
To be fair, you've said all of the following:
In this scenario spirit is a descriptive word which can be used in place of;..attitude as in she has a bad attitude you could say she has a bad spirit.or I'm at a low ebb, could be I'm not in very good spirit. Or he is a very spirited person meaning he is very motivated.
That force is not supernatural but is the air we breathe
It is ONLY because of oxygen any of us can have any so called spirit (remembering before there was ever such a word descriptive or otherwise there was the air we breathe )
That is the spirit of life which then in turn is fundamental to our continuing our development until finally our last breath goes out and as some would say his/her spirit is finally gone, in other words no more. breath no more spirit for that individual.
Therefore our human spirit in all its guises is a combination of the brains formulation of our desires and goals for whatever purpose and the way we bring that to fruition.
Every breath you take allows you to continue in a spirited way ie as all human beings
You've called spirit composite air, oxygen, attitude, breath, taking breaths and the brain. Could you just, in one sentence, clearly state exactly what you are saying spirit is? I apologize if I misunderstand, but you've called it so many thing it's hard to know exactly what you mean.