Tech Insider : Business
Composite image of a woman running, wearing a vest that reads,
In 1967, Kathrine Switzer became the first woman to officially run the Boston Marathon. A race official tried to stop her (right).
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Linda Carrier holding her World Marathon Challenge medals; Carrier running one of the World Marathon Challenge races.
Linda Carrier has completed the World Marathon Challenge three times.
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Smoking
Smoking "Uncle Chen" as he ran the Xin'anjiang Marathon.
Tech Insider : Sports
london marathon
Runners pass Big Ben during the London Marathon.

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Tech Insider : Sports
Two side-by-side pictures of a runner.
A side-by-side comparison of Sergio Motsoeneng and his brother, Arnold Motsoeneng, racing in the Comrades in 1999.