Thousands of runners form a ribbon of pink as the starting gun of the 2017 Wuxi Marathon launches the race in the Jiangsu province city of Wuxi on March 19. Pink was the thematic color of this year's race. [Photo provided by organizing committee of Wuxi Marathon]

Runners take their place on the line and are ready for the starter's gun at the 2017 Wuxi Marathon. [Photo provided by organizing committee of Wuxi Marathon]