Why is it that we don’t often breath to our full capacity, we take shallow breathes and rarely take full breath

Question

Why is it that we don’t often breath to our full capacity, we take shallow breathes and rarely take full breath

In: 680

Answer 1

You’ll need your full lung capacity when you run (or do some other exercise).

It’s the same reason why our heart rate is not at >180bpm all the time, our blood pressure not at >200mmHg, we are not all-out sweating without need and so on.

Regular, shallow breaths just seem to work best when there is not more demand.