This evening, from 8-9pm CT, Dathan Ritzenhein and Matt Tegenkamp will be doing a Twitter Q&A for the Bank of America Chicago Marathon.

Get ready for a #TwitterChat with elite runners @djritzenhein and @MattTegenkamp on Sept. 19, 8-9 pm CST. Use #chimarathon with your Q’s.

— Chicago Marathon (@ChiMarathon) September 18, 2013