Rob Kardashian: I Want to Lose 40 Lbs. by Summer

03/17/2013 at 07:00 PM EDT

Rob Kardashian Talks Losing Weight
STARPICZ/Splash News Online
After revealing on social media that he's put on weight over the last year, Rob Kardashian has been working hard to shed the pounds.

"I'm trying to lose 40," the Keeping Up with the Kardashians star told PEOPLE at his birthday party Friday at 1 OAK Las Vegas. "It's a little journey."

Kardashian, who turned 26 on Sunday, said he works out twice a day – in the morning with a trainer and later with his friends.

Calling his recent 240 lb. weight his starting point, he dropped 5 lbs. last week and wants to get down to 200 lbs. by the Fourth of July.

Though Kardashian says "good eating" is what expanded his waistline, he reportedly put on the weight following his breakup with singer Rita Ora and when he stopped performing on Dancing with the Stars at the end of 2011.

Aside from his group of about 30 friends he works out with, Kardashian has someone else in his corner: former Dancing partner Cheryl Burke.

"We've been running and doing our own little things and it's good," he says.

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