Though she hadn't realized she'd broken any sort of glass ceiling, who is credited as the first woman to complete a marathon?

Covering the rugged course of the Colorado Pikes Peak Marathon in nine hours with her daughter, who ran six hours of the race with her, Arlene Pieper had no idea that the race had a significant place in running history until a historian called her up half a century later. At the time of her race, Pieper had signed up to promote Arlene’s Health Studio, a gym she owned with her husband.

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