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.

Source:
http://www.greatist.com/fitness/why-do-we-yawn-when-working-out/