Things have surely changed for Christian country singer Carrie Underwood ever since she gave birth to her son Isaiah Michael Fisher last February. But that does not mean that the new mom is easing up on her fitness regimen or singing career.

"Life with a little one will sometimes be chaotic, but every mom tries to make a schedule for feeding and naps," Underwood's trainer Erin Oprea told E! News. "This is where the plan is crucial. When it's nap time, it's mom time."

Underwood is pretty keen on losing her baby weight, and that is why she and Oprea make the most out of "mom time" to get her pre-pregnancy body back.

"We do lots of lunges, squats, plyometrics, stairs, pull-ups along with weight training," shared Oprea. "The key to the success is keeping all of this at your level and not to do too much too soon. Listen to your body."

When she's not busy working out, Underwood can be found in the studio creating new songs for her brand-new album. During one work session, she even brought her hubby and baby along.

On her Instagram account (@carrieunderwood), the singer posted a photo of her professional hockey player husband Fisher and son Isaiah (who had noise-cancelling headphones on!) enjoying a nap together on the couch while she was hard at work.

"Isaiah's first band rehearsal...as you can see he & his daddy were totally into it!" she captioned the photo.

Fisher earlier said he enjoys taking afternoon naps with his son on his La-Z-Boy recliner. "You're just cuddling together. Just being together. It's the best, for sure," he told The Tennessean.

Sometimes his work requires him to be away from home for several days straight, and Fisher lamented that he misses out a lot on his son's growth and development.

"You come back from eight days, and it's like, holy cow, he changed so much," he said. "It's crazy how fast it goes. You almost want to slow down time a little bit."