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Thousands of athletes competed in the  31st  annual Chicago Life Time Triathlon Sunday.

Competitors swam in Monroe Harbor, then biked along Lake Shore Drive and then ran along the Southern Lakefront.

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Triathletes participate in the 31st annual Life Time Chicago Triathlon at Monroe Harbor in Lake Michigan on Aug. 25. — Jose M. Osorio / Chicago Tribune, Aug. 25, 2013

More than 7,000 competitors were expected to take part in the race today.

On Saturday, 1,500 kids and para-athletes competed on the city’s North Side.