His sister has been known to endure 4am work-outs to maintain her incredible figure.
But it seems that Rob Kardashian doesn't share the same interest in general fitness.
The 26-year-old Reality star stepped out on Wednesday in an all-black outfit that proved to be not so slimming.
Looking fuller-faced as he strolled along in a tracksuit, Rob has been the first to admit that he needs to change his lifestyle.
He said recently to ET: 'Getting healthy...is huge for me. I've really just kind of changed my whole lifestyle with taking supplements and working out twice a day'.
'I really needed a change. There's just a lot going on in my family, a lot of stress and negative attention. So, this is just part of that positive reset button.'All I'm just trying to focus on is my health and just getting back to that happy point,' he said.
'I feel like people see a lot of unhappy points, which is not me. I just want to get back to the good points. I'm 26 years old; I'm supposed to be enjoying my life.'
On the show, Keeping Up With The Kardashians, Rob confided in Lamar Odom about his weight gain earlier this year.
'I've just not been feeling myself, gaining a bunch of weight. It's frustrating, I'm not happy going out when I'm not in good shape.' he said.
Adding 'If I don't get myself together in six months then I won't want to hang around everybody.'
Read more: Rob Kardashian battles the bulge as he steps out in a not-so-slimming black ensemble | Mail Online
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Rob looks like Chaz Bono.![]()
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