Mental toughness. So much of it is between your own ears and fighting that doubt. We will always have that doubt, but that's what keeps us on edge and keeps us working harder. Even up to mile 25 it was like, "Can I go another mile?" It's like, "Yes, I can." [It's] that internal battle that you have to keep fighting and winning.Jennie Finch in an interview with CNN Health on running her first marathon last November just four months after giving birth to her son Diesel. The former standout softball player at the University of Arizona who lead Team USA to two world championships and two Olympic medals, ran the 2011 ING New York City Marathon in 4:05:26. She started the race dead last and passed 30,397 people on her way to the finish line earning more than $30,000 for charity.