When it comes to being the best in the world, it's important for players to have workout routines that make them sweat. Sofia Kenin may be the Australian Open champion, but that doesn't mean she is taking things easy in the gym.

On Instagram, the 21-year-old showed off her boxing skills, a new element added to her workout to boost cardio—plus, it's fun to hit things. Pounding away at pads, Kenin ducks, weaves and jabs to work up a sweat.

Many players have added boxing to their workout routine, including Maria Sharapova, Caroline Wozniacki and Serena Williams, the latter who got the chance to hit around with the great Mike Tyson.

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Kenin is prepping for the 2021 Australian Open where she will try to be the first WTA player since Victoria Azarenka in 2013 to successfully defend the title.