Why do I need to spit phlegm when I'm doing a rigorous jog?

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Sean Moore

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Sean Moore  asked the Naked Scientists:

Hey Chris,
Obviously I love the show. Only a fool couldn't.

Why do I need to spit phlegm when I'm doing a rigorous jog?

Sean Moore
-Winnipeg, Manitoba, Canada

What do you think?

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Offline JnA

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Why do I need to spit phlegm when I'm doing a rigorous jog?
« Reply #1 on: 27/08/2008 08:24:00 »
You are breathing deeper, using your lungs more effectively (than at rest) and shifting mucous around and, as far as the lungs are concerned, the only way is up, baby.