Serena Williams has been taking a GLP-1 medication to help with her recent weight loss, she revealed for the first time in an exclusive TODAY interview .

The 23-time Grand Slam champion shared her decision to take a weight loss drug following the birth of her second daughter as part of her partnership with health care company Ro , for which she is a paid spokesperson.

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She tells TODAY.com that she has lost 31 pounds since starting the medication about a year ago. She has not disclosed which kind.

"I was on and off (the medication) and now completely on," she says. "It was a really good decision I had to make for my life, you know, I tried everything."

"This all started after I had my (first) kid," she cont

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