Female mentors are a bigger deal than you think—and the astronomic rise of these three track-star sisters is proof

For the Sheppard sisters—Tai, 13; Rainn, 12; and Brooke, 10, the totally inspirational track phenoms who won Sports Illustrated Kids' SportsKid of the Year award in 2016—the cheerleader pushing them toward their Olympic goals has been their track coach Jean Bell, and her impact has been huge.

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