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Joan Benoit Samuelson is a trailblazer. In 1984, she became the first woman ever to win gold in an Olympic marathon and, decades later, she continues to push further. At 50, she set a record as the fastest U.S. woman in her age group with a marathon time of 2:49:08. Two years later, she ran the fastest-ever time by a woman older than 52 and, at 55, she again proved to be the fastest female marathoner ever in her age group, running 2:47:50 and 2:50:33, respectively.

Now, having turned 60 in May, she still shows no signs of slowing down. So, what's her secret? What