pet snakestiptip

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/112/42/13...
http://jeb.biologists.org/content/215...
http://www.sciencedirect.com/science/...
https://www.ncbi.nlm.nih.gov/pmc/arti...

Image Sources:
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...

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