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After a good distance of running, you might have felt a sensation of happiness. That is the runner's high and some chemicals in your body cause i (more)

After a good distance of running, you might have felt a sensation of happiness. That is the runner's high and some chemicals in your body cause it.

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Sources:
http://www.pnas.org/content/112/42/13105.full
http://jeb.biologists.org/content/215/8/1331?sid%3D739917de-aaf2-469d-9f3a-ab04329720...

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