This British distance runner holds four marathon world records! In 2013, she won both the Antarctic Ice Marathon and the North Pole Marathon, this despite the fact that she's missing a kneecap. Vegan since childhood, she is believed to be the first vegan female to complete the Marathon des Sables, a famously grueling challenge that involves a six-day, 250 km ultramarathon, which is about the distance of six regular marathons. WOW!