"She's in baby heaven. She's excited to get started, but she's really calm about it all," her trainer, Tracy Anderson told Us Weekly.
"It's a tough time, and a lot of women feel like it's a huge mountain to climb to get back, but Kim, surprisingly, has had the totally opposite reaction to other moms," Anderson said. "She's like, 'We're going to be so good. It's fun, I feel great!' She just loves the whole process."
Anderson is already structuring Kardashian's exercise routine, though the reality star won't begin working out until five weeks after baby North's birth.
Kardashian, 32, and the baby's father, Kanye West, 36, welcomed their first child June 15.
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Anderson said she will focus first on Kardashian's muscular structure.
"In the beginning, it's key getting the deep abdominal muscles back and making sure that you get the strength back in the right layers," she explained.
The fitness guru, whose celebrity clients include Gwyneth Paltrow, Jennifer Lopez and Bethenny Frankel , is tailoring a program specifically for Kardashian.
"She's not going to be doing any typical crunches or anything like that," Anderson said, adding that Kardashian will start with four-day-a-week workouts and work her way up to five or six days.
"Kim is super motivated. She's all in," Anderson said. "Pregnancy is actually an opportunity for women to look better than ever. And [Kim] will."