The fourth annual Bank of America Chicago 13.1 half marathon is expected to bring 10,000 runners through the West Side on Sunday. The course starts and ends at Garfield Park and takes runners through Douglass Park and Humboldt Park.

This week's primary isn't the only race in town. Amateur runners can apply for a spot in the 39th annual Chicago Marathon starting at 10 a.m. Tuesday.

A marathon last month in Antarctica was the first of seven on seven continents ... in seven days. Two of the competitors are back in Chicago to tell the story–including the winner.