19 | Cheryl Treworgy
In December 1971, Cheryl Bridges (now Cheryl Treworgy) became the first woman in the world to break 2:50 in the marathon. Treworgy decided to try running in 1964, when she was in high school; though she had no girls' teams to train with, she soon began competing and excelling. Eventually, she ran on five world cross-country teams and came in fourth at the 1969 international cross-country championships. A little more than three decades after Treworgy's world-record marathon, one of her daughters, Shalane Flanagan, started winning championships, and she medaled at the 2008 Olympics. Once…
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