Guinness World record holder Juliana Buhring is the first and fastest woman to cycle the globe . Sandra Nyad completed a landmark swim from Canada to the Florida Straits this week . The 64-year - old had made three attempts to complete the trip since 2001 . CNN looks at the women who have broken world records in extreme sports .
Sandra Nyad completed a landmark swim from Canada to the Florida Straits this week . The 64-year - old had made three attempts to complete the trip since 2001 . CNN looks at the women who have broken world records in extreme sports .