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Almost 10,000 triathletes participated in this weekend’s Chicago Triathlon. The race, now in its 36th year, took place Sunday with staggered start times. The swim portion of the triathlon was canceled due to “unfavorable swim conditions” on Lake Michigan, forcing athletes to complete a duathlon instead.

Participants wait in line to compete in the 36th annual Chicago Triathlon on Aug. 25, 2019. The swim portion of the race was canceled because of strong waves, making it a duathlon.
Participants wait in line to compete in the 36th annual Chicago Triathlon on Aug. 25, 2019. The swim portion of the race was canceled because of strong waves, making it a duathlon.
Chicago Triathlon workers prepare for the race to begin at twilight Aug. 25, 2019.
Chicago Triathlon workers prepare for the race to begin at twilight Aug. 25, 2019.
Participants put their hands over their hearts during the national anthem moments before the duathlon begins Aug. 25, 2019.
Participants put their hands over their hearts during the national anthem moments before the duathlon begins Aug. 25, 2019.
Participants take off running along Lake Michigan at the start of the duathlon Aug. 25, 2019.
Participants take off running along Lake Michigan at the start of the duathlon Aug. 25, 2019.
Cassie Bertacchi, 31, waits for boyfriend Taylor Eaton, 31, to pass her as he participates in his first triathlon Aug. 25, 2019.
Cassie Bertacchi, 31, waits for boyfriend Taylor Eaton, 31, to pass her as he participates in his first triathlon Aug. 25, 2019.
Participants mount their bikes at the cycling portion's start line Aug. 25, 2019.
Participants mount their bikes at the cycling portion’s start line Aug. 25, 2019.
Participants bike on Randolph Street in the 36th annual Chicago Triathlon on Aug. 25, 2019.
Participants bike on Randolph Street in the 36th annual Chicago Triathlon on Aug. 25, 2019.
Participants mount their bikes at the cycling portion's start line Aug. 25, 2019.
Participants mount their bikes at the cycling portion’s start line Aug. 25, 2019.
Charles Cafaro, 28, of Chicago, bikes on Randolph Street in the 36th annual Chicago Triathlon on Aug. 25, 2019.
Charles Cafaro, 28, of Chicago, bikes on Randolph Street in the 36th annual Chicago Triathlon on Aug. 25, 2019.
Queta Karstens, left, of Park Ridge, waits for her husband and triathlon participant Scot with her son Kaden, right. “He was pretty bummed about the swimming portion getting canceled because that’s where he’s the strongest,” she said.
Uriah Steffen, 33, of Plainfield, Indiana, waits near the biking transition area at the 36th annual Chicago Triathlon on Aug. 25, 2019.
Uriah Steffen, 33, of Plainfield, Indiana, waits near the biking transition area at the 36th annual Chicago Triathlon on Aug. 25, 2019.
A runner taps 8-year-old Isabella Rosales' sign at the 36th annual Chicago Triathlon on Aug. 25, 2019.
A runner taps 8-year-old Isabella Rosales’ sign at the 36th annual Chicago Triathlon on Aug. 25, 2019.
Eric Cathey, 54, of Chicago, runs along Lake Shore Drive during the 36th annual Chicago Triathlon on Aug. 25, 2019.
Eric Cathey, 54, of Chicago, runs along Lake Shore Drive during the 36th annual Chicago Triathlon on Aug. 25, 2019.
Sandra Davila, 35, cools off after finishing the 36th annual Chicago Triathlon on Aug. 25, 2019.
Sandra Davila, 35, cools off after finishing the 36th annual Chicago Triathlon on Aug. 25, 2019.
Melissa Seamonson, left, 46, and Corinne Merten, 45, cheer as they approach the 36th annual Chicago Triathlon finish line Aug. 25, 2019.
Melissa Seamonson, left, 46, and Corinne Merten, 45, cheer as they approach the 36th annual Chicago Triathlon finish line Aug. 25, 2019.
A volunteer dumps ice into a pool for participants to soak in upon completing the 36th annual Chicago Triathlon on Aug. 25, 2019.
A volunteer dumps ice into a pool for participants to soak in upon completing the 36th annual Chicago Triathlon on Aug. 25, 2019.