Overcoming a collapsed lung could be an insurmountable obstacle for most runners, but for Diego Estrada it was just a part of his road to 26.2 and his refusal to let go of his distance running goals. Over the years, Diego qualified to run for the Mexican and the U.S. Olympic team, and slowly moved into longer distances, moving from the 10K up to the marathon distance. But in 2016, as he fought his way into the Olympic trials, one more obstacle got in his way: heat. At the 20-mile mark, Diego pulled out of the race, a DNF. On the Chicago Marathon course that same year, Diego stepped on a bottle, rolled his ankle and grappled with whether there would be one more DNF on his record. With all of those obstacles weighing on his mind as he approaches the 2017 Chicago Marathon, listen to Diego Estrada as he decides to go after another big goal.