ELi5: how does practicing (and getting better at) holding your breath work if your lungs are the same size?

Question

ELi5: how does practicing (and getting better at) holding your breath work if your lungs are the same size?

In: 7

Answer 1

Lung size is only one part of the picture.

You can train to retain more oxygen, use oxygen slower, and resist CO2 acidity (and the impulse to breathe).

Also, though not an extreme amount, you can train to increase your lung capacity.