You are probably familiar with the Armory Indoor Marathon, where in 2016 two world records were set in the 211-lap race around the 200-meter track. And if you’re from the Great Lakes region, you may also be familiar with the smattering of indoor marathons held during the winter season. It would seem that the indoor marathon is on the verge of becoming a “thing.”

Except, indoor marathons aren’t anything new.

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