When you think about excellence in the marathon, the name Deena Kastor inevitably jumps to mind. After all, the 52-year-old held the American record in the distance for a whopping 19 years, setting it first in London in 2003, then bettering her own mark just three years later when she became the first American woman to run under 2:20 . In fact, Kastor—a three-time Olympian, World Marathon Majors champ, World Cross Country medalist, and holder of national records from the 5K up to the 26.2—was drawn to distance from the very first time she hit the track.