Does running a marathon push the body further than it is meant to go?

The conventional wisdom is that distance running leads to debilitating wear and tear, especially on the joints. But that hasn’t stopped runners from flocking to starting lines in record numbers … The scientific evidence supports the notion that humans evolved to be runners. In a 2007 paper in the journal Sports Medicine, Daniel E. Lieberman, a Harvard evolutionary biologist, and Dennis M. Bramble, a biologist at the University of Utah, wrote that several characteristics unique to humans suggested endurance running played an important role in our evolution.

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And: I bloody did it!

Picture: Arnulfo Quimare, a Tarahumara Indian who is a champion distance runner, laces up his sandals for a 50-mile race on canyon trails. Luis Escobar