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Melody Chiu
September 23, 2015 12:35 PM

When he stepped on stage at the iHeartRadio Music Festival in Las Vegas over the weekend, Blake Shelton looked more in shape than ever as he sang his hit songs.

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.”

According to the pal, Shelton – who announced his divorce from Miranda Lambert in July – “really pushed himself before really hard in terms of his schedule so that he could spend with her.”

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.”

RELATED: PHOTOS: The iHeartRadio Music Festival as You’ve Never Seen It Before

For more on Blake Shelton’s life now, pick up the latest issue of PEOPLE, on newsstands Friday.

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