Running has proven to be essential to evolutionary needs.
During the primitive days of humans, running was essential for life, and those
that could run well survived and were able to pass along their traits. The
survival instinct to run has carried on to the present; therefore professors at
University of Arizona researched what makes a person run. They studied the
levels of endocannabinoids, a chemical naturally produced by the body to
lighten moods, of three different mammals: humans, dogs, and ferrets. They
found that humans and dogs produce normal levels of endocannabinoids after
walking, but higher levels after running. Ferrets, animals that do not usually
run, had no change in endocannabinoid levels after running. The increase in
human levels of endocannabinoids after running explains the runner’s high and
the reason why we still run today.
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