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Los Angeles - Rob Kardhashian has become a gym addict!
The reality TV star - who shies away from the celebrity spotlight - is on a mission to get back in shape after reportedly gaining 100lbs (45kg) lately and his personal trainer Gunnar Peterson has insisted the star is working hard at it.
He told People: "Rob is always in! He's slammed schedule-wise and still makes this work."
Gunnar made the comments after an expectant Kim Kardashian revealed she is helping her little brother get back in shape on Twitter on Tuesday.
Rob also shared a pic on Instagram of Tyga and Kylie Jenner with the caption: "Spotted these fools on the morning workout"
And last week Kim added that the pair have been taking hikes together.
Rob, 30, has stayed out of the spotlight and away from his family's fame for almost two years.
That could be about to change as his sister Khloe, 31, said earlier this year that her brother is trying to get his "groove" back.
She said: "Rob definitely has his ups and downs, and he's been struggling for the past year and a half, maybe two years, which I think we've all had those times in our life.
"He's been doing better, but I want Rob to do consistently forever. So right now I'm really proud of him."
