Athletes tend to have a laser focus on their health, so it's no surprise that Serena Williams has leaned into a new sport in retirement.

The busy mom of two daughters tells PEOPLE her next goal is to run a half-marathon next year, and she's keeping a close eye on her diet thanks to a new partnership with Abbott

Serena Williams reveals what her new obsession is amid her tennis retirement. Williams retired from tennis in September 2022.

Don't say the word diet around Serena Williams. "Whenever I'm on a diet, I gain weight," the 43-year-old tennis professional says over the phone from Florida. "I don't even use the word diet." Though "the 'D' word is a bad word around" her,