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Yeah, I'm more apt to believe it's due to a lack/need of oxygen.
I yawn quite a bit after cardio/weight lifting (especially during weight lifting).
Boredom? Tiredness? Sure, but I've yawned when doing things I enjoy while neither tired nor bored... like going up the first hill of a roller coaster or even in the middle of a good movie.
So I dunno.
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I love lamp.
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