Thousands of runners participate in the Bank of America Chicago Marathon October 10, 2010 in Chicago, Illinois.
Not running the Chicago Marathon on Sunday, but have friends and family who are? You can still stay updated on their progress in the sea of runners through text tracking!
You can register here to track up to three runners and receive text message alerts when they cross the 10K, Half, 30K, and finish lines. You can also track one runner via Facebook and three via Twitter if you want to keep tabs on more participants.
The service is free and you can register through Saturday, October 12 at 11 p.m. It's definitely a helpful tool if you're trying to cheer a runner on!