The WTA's premier retiree of 2020, Maria Sharapova hung up the racquets of her pro days in February.

Obviously she's not competing in this impending, radically different US Open. Even so, she can't stop working out. She also "can't stop the feeling," bopping up and down football-stadium steps to a Justin Timberlake track and body-slamming a medicine ball into the field's turf itself.

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"Fit and lit," read Sharapova's caption—proving once again that, though self-removed from the sport, a 33-year-old star forever has fitness goals.