Kevin Jonas Flaunts Fit Frame in Shirtless Workout Clip Shared by Wife Danielle

Kevin Jonas' gym routine is delivering serious results.

To celebrate the debut of his second solo single "Little Things," the 38-year-old member of the Jonas Brothers had his wife Danielle share a glimpse of his fitness regimen on her Instagram Story Friday (May 15). The video captures the shirtless star mid-workout, displaying his sculpted physique as he powers through upper body exercises in black joggers and gray sneakers.

Danielle, 39, accompanied the clip with a playful caption: "'Little Things' out now," she wrote, "and apparently so are the abs."

The track serves as a love letter to his marriage. In a conversation with People, Kevin explained that he penned "Little Things" to celebrate the meaningful details of his relationship with Danielle, whom he has been married to for 16 years.

"It's a great extension of my story with Danielle, it truly is," Kevin shared. "We have three big years ahead of us: we have a big birthday for her this year, a big birthday for me next year, and then our 20th wedding anniversary in 2029, which is an insane thing to think about."

He also revealed that Danielle played a key role in the creative process. "I send her every song and she has a great pop ear," Kevin said. "I was like, 'Babe, this one's about you' and I kept it a secret, but she was very happy."

Beyond his solo work, Kevin is gearing up for a major project alongside his brothers. The Jonas Brothers will reunite for Camp Rock 3, arriving this summer.