Serena Williams is not just one of the world’s premiere female tennis stars, she is also one of the strongest women in the sport. She’s certainly not a lean, slim player, but her entire physique speaks volumes about strength and fitness. Tennis is, after all, a game of speed, strength and endurance, and Serena has mastered all three.

A knee injury from 2004 and a bad hamstring have long hampered her running, and she freely admits that she does not enjoy cardio work, both factors which probably have contributed to her less-than-lean build. Serena has said, “I hate working out more than anything, but I have to — when I’m running, I think about how much I want to win. That’s the only thing that keeps me going.”

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