Fastest Woman Around The World. âSomedays Iâm so tired, having had four hours of sleep total that week, and I might feel sick or emotional, but I know that if I donât muster up the physical and mental strength to keep going, Iâll fall behind. And thatâs not an option,â says Cassie De Pecol, triathlete and Guinness World Recorder chaser. The 26-year-old American has set herself the target of being the fastest woman in the world to visit all 196 countries in less than three years.