Nice article from the NYTimes summing up the evidence that humans evolved as long distance runners. The evidence for our ancestor's marathoning?
-humans have a more efficient cooling system than animals (lots of sweat glands, little body hair, and we don't have to pant)
-Ligaments that act like springs in our lower legs and feet
-The length of our toes (an increase of 20% would double the work-load of the foot)
Check out the article for the complete discussion.
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