BrainStuff
BrainStuff
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Why can't a couch potato run a marathon?
4 minutes Posted Dec 3, 2014 at 6:00 am.
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Intuitively, it makes sense that a trained athlete can run a marathon easily, while a "couch potato" can barely run a mile. But what's the biology behind it? Find out how fit and unfit bodies respond to exercise in this episode.

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