miércoles, 13 de julio de 2011

FAQ Why Do We Yawn When Working Out

As soon as someone lets out a yawn, it spreads like wildfire across the room (and apparently just writing about yawning can set off the chain reaction as well).

Traditionally, yawning has been an indicator of two things: boredom or fatigue. But yawning during exercise might actually be the brains version of an in-workout cool-down.


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