1. Chicago Marathon
Photo: Courtesy of Bank of America Chicago Marathon
2. Arlington Million
Photo: Nicole Marie
3. Shamrock Shuffle
Photo: Courtesy of Shamrock Shuffle
4. Bike the Drive
Photo: Courtesy of Active Transportation Alliance
5. Susan G. Komen Race for the Cure
Photo: Courtesy of Susan G. Komen Race for the Cure
6. Life Time Tri
Photo: Courtesy of Life Time
7. AIDS Walk & Run Chicago
Photo: Dan Paterno
8. L.A.T.E. Ride
Photo: Courtesy of Special Events Management
9. Law Enforcement Torch Run's Polar Plunge
Photo: Doug Pieper/DougPieperPhotography.com
10. Pets Are Worth Saving's Run for Their Lives
Photo: Claire Demos
11. Race to Mackinac
Photo: MISTE Photography