GOING PLACES ON FOOT isn't a particularly glamorous way to get around. Sure, there are proven health, social and environmental benefits. But walking is … well, pedestrian, and for many running is a chore - or something you do when you're late to catch a bus. According to human evolutionary biologist Daniel Lieberman, though, those activities are central to understanding what makes us human. When our ancestors adapted to getting around on two limbs instead of four, that adjustment made its mark on nearly every part of the human body from head to toe (and even our butts).
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