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The first wave of runners stand at the starting line of the 8th annual Transamerica Rock n' Roll Half Marathon at Civic Center Park on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.

A wave of runners leaves the starting line passing the Denver City and County Building at the 8th annual Transamerica Rock n' Roll Half Marathon at Civic Center Park on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.

A wave of runners leaves the starting line at the 8th annual Transamerica Rock n' Roll Half Marathon at Civic Center Park on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.

Atop her dad Patrick's shoulders, Lyla Cuin, 6, looks for her mom Emily to pass them near the finish line of the 8th annual Transamerica Rock n' Roll Half Marathon at Civic Center Park on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.

Damion Dudley poses for a photo after crossing the finish line at the 8th annual Transamerica Rock n' Roll Half Marathon at Civic Center Park on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.

Zachary Dostart, 8, right, hands out metals to the finishers of the 10K race at the 8th annual Transamerica Rock n' Roll Half Marathon at Civic Center Park on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.

A group of cheerleaders greets the runners as they approach the finish line at the 8th annual Transamerica Rock n' Roll Half Marathon at Civic Center Park on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.

With a stress fracture in her foot, Michele Stewart, left, ran the entire 10K race with her daughter Peyton, 11, by her side at the 8th annual Transamerica Rock n' Roll Half Marathon at Civic Center Park on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.

The band 30,000 Days lends some musical support for runners making their way down E. 17th Ave. during the 8th annual Transamerica Rock n' Roll Half Marathon on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.

Members of Cherry Creek Dance wave American flags and voice their support to runners at City Park during the 8th annual Transamerica Rock n' Roll Half Marathon on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.

Raj Rai and members of Cherry Creek Dance, wave the American flag and voice their support to runners at City Park during the 8th annual Transamerica Rock n' Roll Half Marathon on Oct. 15, 2017 in Denver. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park.