Muumuus to Marathons Part 3: Diary of a New Runner

This week, Jennifer Roesner attends her second marathon training session. Just a couple miles in, her old green tennis shoes do her in and her calves start cramping up. She quickly falls behind. Does she give up or does she cross the finish line? Find out in part 3 of "From Muumuus to Marathon: Diary of a New Runner."