Sarah Thomas swims long distances -- very long distances, in fact -- and says she hasn't yet found her limit

Sarah Thomas has set multiple long-distance swimming marks. She has the ability to just keep churning, hour after hour. Recently she did an 80-miler that took her the length of Lake Powell, twice. My story on her for ESPNW.com: http://www.espn.com/espnw/life-style/article/18750386/weekend-warriors-sarah-thomas-pushing-limits-open-water-swimming