Add Yahoo as a preferred source to see more of our stories on Google. Usain Bolt, the world’s fastest person, ran a 100-meter sprint at a speed of 23.35 miles per hour (37.57 kilometers per hour).
Share on Pinterest Runners intuitively run at their most energy-saving speed, according to a new study. Stanislaw Pytel/Getty Images A new study has found runners cannot run at any speed they want ...
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