Rhonda Rousey
Rhonda Rousey is known for a lot of things, but she went to the Olympics for Judo. She was only 17 when she entered the 2004 Olympics (following in her mother's judo footsteps!) She earned a bronze medal in the 2008 Olympics. She started her MMA career in 2011 and became a household name due to her flawless fighting and 12-match winning streak. She retired from UFC and entered a career in the WWE.