Inhale as deeply as you can through your nose. Then start a timer and measure how long it takes for you to deliberately control that exhale until your lungs are empty. I want to point out none of this has to do with cardiovascular fitness level, at least not in any kind of direct way. Some world-class triathletes have very fast carbon dioxide blow-off rates. That is, their discard rates are 20 seconds or less.

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