Rob Kardashian rumors have been flying in regards to his state of mind and the complicated relationship he seems to have with his family, but one thing is certain, he's motivated to get his weight under control.

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"I think Rob knows exactly what to do. He's worked out [before] and he's focused... I know he can do this," Kardashian's longtime friend and celebrity trainer Gunnar Peterson told People

Kardashian had skipped out on his sister Kim's wedding to Kanye West late last month, but he apparently sent a text to Peterson before leaving Paris and immediately put together a workout plan once he arrived back in Los Angeles.

"We're doing intervals with strength movements: squats, the sled, swings and push presses. It's about getting his heart rate up and keeping it up," Peterson said, adding that the Keeping Up with the Kardashians star now has a weekly plan to conquer his weight-loss goals.

"I don't have a scale, I'm not big on measurements. Until a person looks in the mirror and is happy with themselves, you have not reached your fitness goals. The key to anyone's success is staying with it!"

Peterson said Kardashian's biggest struggle will be finding the time to workout in light of his busy schedule.

"The toughest thing is to fit it in. People forget he's in the show, he has the sock business and he has other interests. But with a good diet, the right sleep and steady workouts, he will see changes. He'll start seeing and feeling it in a couple of weeks and will see major changes in six to eight weeks," Peterson explained.

Peterson also told People his friendship with Kardashian, 27, can be beneficial to the reality TV star's weight-loss success.

"I'm a firm believer in trying to make something that might not be considered fun by a lot of people, fun. And hopefully that makes the person have a positive association with it and they want to come back," the trainer said. "Rob works out in beast mode. When I see him, we laugh, have fun and he gets after it hard at the gym."
About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.