Ronda Rousey has overcome personal tragedy to become a star who brought mixed martial arts into the mainstream and who serves as an inspiration to others. An Olympic medalist in martial arts, Rousey made the switch to mixed martial arts in 2010. Dispatching opponents with lightning speed, she built a following that landed her in magazine spreads and in action movies. She lost her first professional bout in 2015, but is still her sport's top attraction.