Novak Djokovic eats a banana during Australian Open 2012; Getty Images
Nutrition
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Anne Keothavong of Great Britain stretches during the Argentina and Great Britain Fed Cup tie in April 2013; Getty Images
Stretching
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MELBOURNE, AUSTRALIA - JANUARY 22:   Rafael Nadal of Spain holds drink bottles in his quarterfinal match against Grigor Dimitrov of Bulgaria during day 10 of the 2014 Australian Open at Melbourne Park on January 22, 2014 in Melbourne, Australia.  (Photo by Clive Brunskill/Getty Images)
Hydration
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