Serena Williams is getting real about her weight-loss journey. Since April, the retired tennis legend has been on a GLP-1 medication that uses a naturally occurring hormone to help regulate blood sugar levels, appetite, and digestion. The drug has helped the athlete lose over 31 lbs.

Serena Williams flaunted her body transformation in a swimsuit after she confessed to using a weight-loss medication. The athlete, 43, sported a bright yellow one-piece as she posed for a series of snaps Thursday. “melanin mellow-yellow ,” she captioned the Instagram carousel and fans were quick to hype her up in the comments.