May 17 2018
The "10K a day" rule first emerged as a goal distance for walking groups in Japan during the 1960s.
Raise your hand if you can run one 6-minute mile? Yeah, neither can we. But when you’re an elite like Sara Hall, you basically run 26 in a row to finish sixth in one of the World Marathon Majors. And check out that elevation chart—this course was not the hilliest, but it definitely wasn’t the flattest either!