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PHILADELPHIA (CBS) — For the 14th year, the “Philadelphia Escape Triathlon” took over Fairmount Park.

Thousands descended on the city’s historic park to run, bike and swim in the Schuylkill River on Sunday morning.

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Longtime endurance athletes say this is one of the region’s premier triathlons, offering a good challenge that keeps them coming back each year.

The race’s official charity partner this year is Alex’s Lemonade Stand Foundation, the national organization dedicated to fighting childhood cancer.