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When your muscles work, they do a lot of chemistry. Some of that chemistry involves using up oxygen and producing carbon dioxide. The carbon dioxide needs to be removed from your blood, and the oxygen needs to be replaced, (or the muscles will quit working properly) - and your lungs do both of those things. When you're panting, you're blowing off the extra carbon dioxide your muscles made, and pulling in more oxygen. (You're also blowing out some of the extra heat you're making, and pulling in cooler air, so the panting helps prevent overheating - but it's mostly about the oxygen and carbon dioxide.)

It's good to do some deep breathing right before you exercise, to build up some extra oxygen.

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