39-year-old collapsed during event in June American won world title in 2011 Former 1500m world champion Jenny Simpson says she will not return to running after she collapsed during a track event in June . Simpson, a three-time Olympian and one of the most accomplished American female runners in ...

Source: [Guardian US](https://www.theguardian.com/sport/2026/aug/21/former-1500m-world-champion-jenny-simpson-steps-away-from-running-after-cardiac-arrest)

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