The American socialite, who flew 11 hours for a dress fitting last week, is working with Gunnar Peterson and Tracy Anderson in order to look her best for her August 20 nuptials to NBA player Kris Humphries.
"With me, she's doing free-arm [exercises], where I'm changing the movements all the time, and also dance aerobics," Anderson told Us Weekly
Meanwhile, a source told the website that Kardashian is also on a diet. They claimed that the reality star has forbidden herself from eating any unhealthy food.
"She's cut out fatty foods and sugar," the insider revealed.
Kardashian's wedding to Humphries will air as part of a four-hour special on E! in October.
Earlier this month, the Keeping Up with the Kardashians star confirmed that Vera Wang will be designing her wedding gown.
Kardashian recently revealed that she was very selective in choosing who to invite to the wedding, admitting that she turned down a number of her mother Kris Jenner's suggestions regarding who to include in the festivities.