The Bank of America Chicago 13.1 is just hours away, with hundreds of runners preparing for the start-of-summer race on the city's West Side.

The fourth annual Bank of America Chicago 13.1 is underway Sunday morning, with about 10,000 runners weaving throughout the city’s West Side. The half-marathon began and will end in Garfield Park, with the course taking runners through the historic parks and boulevards of the West Side in between,