July 15, 2014 10:00 AM

John Sciulli/Getty

Kelly Rowland is having no trouble finding her motivation to stay fit during her pregnancy.

“Her number one concern is just to be healthy for her baby,” her trainer, Jeanette Jenkins, told PEOPLE at a party celebrating the 100th birthday of American icon Jack LaLanne in Los Angeles on Thursday. “She’s going to be the most incredible mom.”

Jenkins says the mother-to-be has been maintaining a regular workout schedule.

“We work out Monday through Friday, but we just keep it at a moderate level,” says Jenkins. “We stay within her doctor’s guidelines and work out anywhere from 30 minutes to an hour so it’s not anything exorbitant.”

She adds, “We do cardio, we do yoga and we do light weight training.”

Plus Rowland, 33, has been incorporating meditation as part of her prenatal routine (which the singer shared a belly-baring photo of herself enjoying on her Facebook page).

When it comes time for Rowland to welcome her new little bundle with husband Tim Weatherspoon, Jenkins has no doubt that the former X-Factor judge will be able to bounce back to her pre-baby body quickly.

“We’ll make sure she gets those sexy abs back as soon as the baby comes out!” jokes Jenkins.

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— Gabrielle Olya

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