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 October 15, 2017 in Denver, Colorado. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park. (Photo by Kathryn Scott/The Denver Post via Getty Images)
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Rock n' Roll Half Marathon.
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Transamerica Rock 'n' Roll Denver Half Marathon
Wheelchair racers lead the way at the start of the 8th annual Transamerica Rock n' Roll Half Marathon at Civic Center Park on October 15, 2017 in Denver, Colorado. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park. (Photo by Kathryn Scott/The Denver Post via Getty Images)
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Transamerica Rock 'n' Roll Denver Half Marathon
(credit: CBS)
Rock n' Roll Half Marathon.
DENVER, CO - OCTOBER 15: 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 October 15, 2017 in Denver, Colorado. The race also includes a 5K and 10K as the course runs through the streets of Denver and through City Park. (Photo by Kathryn Scott/The Denver Post via Getty Images)