Not slowing down: Heavily pregnant Serena Williams shows off her baby bump as she hits the gym for a workout

She’s due to welcome her baby at the start of September. 

And being into her ninth month of pregnancy isn’t slowing down Serena Williams’ commitment to fitness. 

The 35-year-old tennis star kept her glutes in check as she bust out some impressive squats on Snapchat on Thursday. 

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