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Yawning

Why do you yawn while working out?

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June 04, 2009 6:18AM

Well, for one thing we don't even know WHY we yawn.

A quite plausible theory is that we yawn to get more oxygen because our tired bodies can't gain enough through normal breathing.

Another one is that it's a way to relieve tension and stress.

Yawning is almost always a sign of sleepiness and is common in the morning or late at night. When you work out remember to have plenty of rest, food and water beforehand.