The GOAT is bounding out of retirement. Tennis great Serena Williams is back in the game, after openly endorsing GLP-1s for weight loss , and emphasizing how great her knees feel at her new, lower weight. "I'm moving better on Ro," she said in a Super Bowl ad for Ro, a telehealth company that prescribes Ozempic, Wegovy, and Zepbound. (Williams' husband, Reddit cofounder Alexis Ohanian, sits on the board and is a major investor.) In the commercial, Williams said she can move more easily and