In the third episode of "Running: State of the Sport," we chat with American marathon legend, Deena Kastor. Kastor took a bronze medal in the 2004 Athens Olympic Marathon, was outright winner of the Chicago and London Marathons, and also the first American female to break 2:20 in the marathon.

And that's just for beginners. In addition, Kastor won 8 National Cross Country Championships, and still holds the American masters marathon record for women (2:27:47), set at the Chicago Marathon when she was 42.

Kastor also wrote the best-selling memoir, Let Your Mind Run.

Before speaking with Kastor, Amby and George discuss the amazing results from the Berlin Marathon, where Tigst Assafa set a world record, 2:11:53--that's 5:02 per mile pace! George believes there's plenty of reason to believe that Assafa has the talent and background to run so fast, while Amby remains a bit skeptical of her big breakthrough. 

Both agreed on one thing, however: Eliud Kipchoge's victory in 2:02:42 marked a strong comeback from his disappointing sixth at Boston last April, and establishes him as the man to beat at the Paris Olympics next summer. Should Kipchoge succeed there, he'll become the first runner to win three successive Olympic Marathons.