Rob Kardashian went on a hike in Culver City, Calif. on Wednesday, wearing a shorts-and-spandex outfit in his continuous attempt to lose weight, TMZ reported.

The reality star said in February that he gained weight due to his relationship with ex-girlfriend Rita Ora.

"All I did was waste a lot of money and gain 40 pounds," he said on an episode of Kourtney & Kim Take Miami. "I need to focus on me. That’s all I wanna be about."

Kardashian reportedly assaulted a photographer last month after she took a photograph of him in West Hollywood. According to the report, the reality star was on a weight loss program and didn't want photos taken of him walking around without a shirt. The photographer filed a criminal complaint and sued Kardashian for robbery and assault.

Kardashian has also reportedly been having difficulty in keeping up with the same level of fame as his sisters. “There’s a lot of haters in the world,” he said, according to the New York Daily News.

Kardashian recently launched the sock line Arthur George, which gives the reality star a break away from the reality show-lifestyle many of his other family members live.

“I really like socks,” he explained. “Now that’s turning into boxers and pajamas. I’m excited to have a niche.”

Keeping Up With the Kardashians will return to E! in June.

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Rob kardashian, Keeping Up With The Kardashians