Tennis Wellness See all topics Facebook Tweet Email Link Link Copied! Follow As seven-time grand slam singles champion Venus Williams said upon her comeback to the sport late last month: “Do you know how hard it is to play tennis? … You’re running the whole time, lifting weights and just, like, dying. And then you repeat it the next day.” Fellow American Frances Tiafoe voiced a similar belief last year: “It’s the hardest sport in the world,” he told Sky Sports . So, what is it that makes tennis

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