I used to do Buteyko breathing exercises. The main idea is that over breathing results in a loss of co2 and less co2 in the body results in less oxygen being re

I used to do Buteyko breathing exercises. The main idea is that over breathing results in a loss of co2 and less co2 in the body results in less oxygen being released from the blood due to the Bohr Effect https://en.wikipedia.org/wiki/Bohr_effect https://en.wikipedia.org/wiki/Bohr_effect.