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Angelique Kerber: How the gym has changed my tennis
World number two Angelique Kerber reveals her tips for getting grand slam fit - just in time for the final slam of the year.

02:31 - Source: CNN
Open Court 's US Open preview show 6 videos
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Angelique Kerber: How the gym has changed my tennis
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NEW YORK, NY - SEPTEMBER 13: Novak Djokovic of Serbia celebrates with the winner's trophy after defeating Roger Federer of Switzerland during their Men's Singles Final match on Day Fourteen of the 2015 US Open at the USTA Billie Jean King National Tennis Center on September 13, 2015 in the Flushing neighborhood of the Queens borough of New York City. Djokovic defeated Federer 6-4, 5-7, 6-4, 6-4. (Photo by Maddie Meyer/Getty Images)
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The retractable roof over Arthur Ashe Stadium in the closed position at the USTA Billie Jean King National Tennis Center August 2, 2016 in New york. / AFP / DON EMMERT (Photo credit should read DON EMMERT/AFP/Getty Images)
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