Before free-divers do a dive they spend time doing deep breathing and quick breathing. The purpose of this breathing is to maximize the amount of oxygen in the cells. The extra oxygen in their system enables them to dive deeper and longer.
In Scott Carney’s new book, he says that ordinarily he can do 20 pushups. While researching his book he attended a workshop where he and the other workshop participants did deep and quick breathing for an hour. At the end of the hour the participants were instructed to do pushups. Carney did 40 pushups – while holding his breath!
Today I figured that I would give this a try. I went for a one hour walk. During the walk I did a lot of deep breathing. After the walk I worked out. My personal best went from 2 reps to 5 reps!
Interesting note in Carney’s book: Controlled hyperventilation will increase oxygen saturation in the blood to 100%, but more significantly, it also expels CO2 which your body uses to gauge when to gasp.