You may have seen Mirna Valerio, “The Mirnavator.” Her video with REI had millions of views on Facebook. It starts with her reading an angry letter from a guy who wrote to her while she was doing a 50k run calling her a “fraud,” a “liar,” and said she was faking running ultra-marathons. Well, Mirna can not only run, but she’s a true force of nature. A few years ago, when Mirna started doing longer runs, she started the site called Fat Girl Running.