17. Mia St. John
Source: Iconosquare
A Mexican-American mother of two, Mia St. John didn’t start her boxing career until the age of 29. That didn’t keep her from making waves in the sport as she moved through the ranks quickly and eventually became WBC, IBFA, and IBA champion. “The Knockout,” as she was tabbed in the boxing community, also did a Playboy shoot to showcase her feminine side.