In 2016, Imagine Dragons frontman Dan Reynolds revealed he’d been battling a chronic inflammatory condition known as AS since he was 21. Now, the 30-year-old musician has announced that he’s won that battle. Reynolds credits his recovery  ti “correct diet, vitamins and exercise,” as well as his work with trainer Brad Feinberg. He also shared a before-and-after photo illustrating how much more fit he’s become. Imagine Dragons are currently on tour behind their hit album Evolve, while Reynolds’ new documentary Believer just premiered on HBO.