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Although she welcomed her first child just three months ago, country singing superstar Carrie Underwood is launching a new fitness line called Calia.

“Having a baby definitely changes your routine, and I have to work around his schedule,” the singer, 32, told PEOPLE.

The country star and her husband, Nashville Predators player Mike Fisher — who will celebrate their fifth anniversary on July 10 — welcomed son Isaiah Michael, on Feb. 27.

“Whenever he goes to sleep, I do the things I need to do for myself and make workouts happen when they can,” Carrie shared.

In the past few months, the singer has been keeping busy juggling motherhood, music and her new fashion line.

“I really haven’t taken that much time ‘off’ because there are always things to do,” Carrie said. “It’s been really nice to be able to focus my attention on Isaiah and our family. It’s been really good! But it’s been really nice as well to be creative, working on music, working on Calia. Making clothing that every woman can wear and enjoy makes me feel good.”

Not to mention all the funky duds! “Definitely one of the most fun parts is all the great clothes I get to wear,” she laughed.

As for her return to the stage — which kicks off June 9 at the Grand Ole Opry, followed by June 10’s CMT Music Awards and CMA MusicFest on June 13 — the American Idol alum can’t wait to perform.

“I’m excited to get back onstage,” she said.

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