Rob Kardashian is workin' on his fitness ... with his sisters!

In a new clip for the upcoming episode of "Keeping Up With the Kardashians," Kim and Khloe Kardashian are working up a sweat with Rob, in an effort to keep his weight loss goals on track.

But, this was before all of that Kimye wedding drama, where Rob reportedly left Europe before the nuptials because he reportedly felt too out of shape to pose in the family's wedding photos. 


In the clip above, Mrs. Kanye West seems to be showing up her siblings during the grueling workout.

"It seems like Kim set up this hike to showcase her energy because she is moving and grooving," Khloe says in the video. "All Kim does is talk about fitness and what she's eating. I just feel like everything is a competition."

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The reality starlet's workouts are clearly paying off!

North West's mama continued to flaunt her killer curves on Wednesday in the Hamptons, rocking a low-cut, skin-tight gray cotton dress. She completed her look with a pair of nude strappy sandals and a classic ponytail.

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Khloe may have trailed behind her big sister during their hike, but she is solidifying her position as the sexiest Kardashian sister today. She stole the spotlight from Kim, rocking a white lace crop top and a fitted black pencil skirt.

Who do you think looks hotter: Kim or Khloe? Sound off!

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