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Burning those calories! Yo-yo dieter Rob Kardashian joins Khloe and Kourtney in grueling workout after he skipped Kendall's 21st party

Published: 18:38 EDT, 3 November 2016 | Updated: 03:49 EDT, 4 November 2016

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Rob, Khloe and Kourtney Kardashian were seen doing an invigorating workout as they documented their exercise on Snapchat on Thursday.

Rob and his bride-to-be Blac Chyna decided to miss out on Kendall's 21st but his sisters were there to celebrate with the young model.

The first thing they showed was a bunch of gym equipment including weights and a skipping rope.

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Time to burn: Rob, Khloe and Kourtney Kardashian were seen enduring an invigorating workout as they documented their exercise on Snapchat

The trio decided to get down and dirty for a workout with Kourtney captioning one of the videos: 'Today's torture.'

In another shot the siblings were seen lined up against a wall in a squat position as they were all holding small medicine balls, to up the ante.

Another photo showed a very hard working Rob doing some arm exercises and Kourtney doing some squats with weights as Khloe captioned it: 'Back at it.'

Get ready: The first thing they showed was a bunch of gym equipment including weights and a skipping rope

And press: In another shot the trio were seen lined up against a wall in a squat position as they were all holding small medicine balls, to up the ante

The mother-of-three showed off her petite frame in a pair of leggings and a small black sports bra.

Khloe opted to wear patterned leggings and bright fuchsia trainers.

It really looked as though the trio were being put through their paces during their workout.

Rob has recently lost a tonne of weight after getting together with Chyna, who he says has been his muse and inspiration.

Feeling bright: Khloe opted to wear patterned leggings and bold fuchsia trainers

Rob's in shape: He revealed this summer that he no longer has diabetes thanks to Chyna's home cooking

He revealed this summer that he no longer has diabetes thanks to Chyna's home cooking.

'I dropped 30 pounds really quickly,' he said after Chyna put him on a diet in January.

'But I gained about 20 pounds back. So now I am in that uncomfortable state again. I weigh 285 pounds now. I've got to get back into the routine.

'But it's hard because she's pregnant and eats whatever she wants, and I enjoy eating with her.

Work it: Another photo showed a very hard working Rob doing some arm exercises and Kourtney doing some squats with weights as Khloe captioned it: 'Back at it'

No doubt the siblings were trying to burn some calories after a night of celebrating with their little sister Kendall for her 21st birthday on Wednesday evening.

Khloe and Kourtney temporarily stole the show in chic co-coordinating mini dresses - flashing their slender pins as they arrived at LA hotspot Catch to kick off the festivities.

Ooh la la: The mother-of-three showed off her petite frame in a pair of leggings and a small black sports bra

The eldest of the clan Kourtney first caught attention in a high-shine metallic mini dress, which clung to her petite and womanly frame.

The pint-sized star then layered a sleek black biker jacket on top, which she draped casually and effortlessly across her shoulders.

Helping him: Rob revealed he dropped 30 pounds really quickly after Chyna put him on a diet

By her side was younger sister Khloe, who matched her best pal in an equally short and chic mini frock.

The tall blonde emphasised her enviably womanly curves in a figure-hugging black dress, which fell to mid-thigh to show off her long and lean bronzed legs for all to see.

Khloe emphasised her naturally stunning features by styling her blonde bob into simple tousled curls, and adding a slick of dark lashes and taupe lipstick.

Beautiful: Khloe and Kourtney temporarily stole the show in chic co-coordinating mini dresses - flashing their slender pins as they arrived at LA hotspot Catch to kick off the festivities