With a red Solo cup in hand (“When I get nervous, I tend to drink a little bit,” he told the crowd), The Voice coach played a 25-minute set and talked about his new music.
So what’s behind his sudden slim down?
“He’s working out and taking care of himself,” says a friend. “He worked out before, but now he has more time and he’s just in a really healthy place.”
Blake Shelton and Miranda Lambert Split: Inside Their Small-Town Life
Now that he’s flying solo and is “no longer working his schedule around someone else,” the star – who’s releasing his next album Reloaded: 20 #1 Hits on Oct. 23 – has been hitting the gym.
“He’s putting energy into his music and his health,” says the friend. “He looks fantastic.”
For more on Blake Shelton’s life now, pick up the latest issue of PEOPLE, on newsstands Friday.