38. Sloane Stephens / WTA TENNIS
Ranked No. 21 in the world, Stephens already has three WTA titles under her belt this year, and her fitness routines prove she’s prepping her body to win a few more. Stephens typically does a morning workout in the gym followed by a couple of hours of work on the tennis courts. From battle ropes on Bosu balls to pull-ups and more, the 5’7” Stephens works hard for her fitness.