Fresh off his engagement to Blac Chyna, Rob Kardashian has starting a weight loss program and has enlisted his future wife to be his trainer.

Chyna took to Snapchat on Wednesday to announce that she is going to put Kardashian on a training regime for the next five weeks, with the goal to lose about 50 pounds by her birthday on May 11.

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"Today I'm going to train Rob," the 27-year-old says in the Snapchat story. "We're going to start a journey, I'm going to start training him myself."

Kardashian, 29, then steps on the scale to reveal his weight, which comes in at 248.4 pounds. In subsequent clips, Chyna films the Keeping Up with the Kardashians star stating his name, weight and height to the camera. "Rob Kardashian, 250 pounds, 6-1," he says before revealing his target weight of 210-200 pounds.

Chyna then asks Kardashian for his consent to train him for the next few weeks. "So I need to consent, do you give me permission to train you for the next 5 weeks every day?" she asks, to which Rob replies "Of course."

In Snapchat videos posted later, Chyna can be seen encouraging Kardashian as he sweats it out on the treadmill, starting with a brief warm-up before a jog.

"How was your first workout?" Chyna asks her future hubby after the session, as he looks at the camera, too exhausted to respond, letting his sweaty t-shirt do the talking.

Kardashian has lost 65 pounds since putting on a 100 pounds in a duration of three years and the credit goes to Chyna, who hired a personal trainer and a chef to slim her man down.

Check out the Snapchat clips below:

A video posted by Rob Kardashian Snapchats (@robphuckedme) on Apr 6, 2016 at 4:52pm PDT

A video posted by Rob Kardashian Snapchats (@robphuckedme) on Apr 6, 2016 at 4:53pm PDT

A video posted by Rob Kardashian Snapchats (@robphuckedme) on Apr 6, 2016 at 5:37pm PDT

A video posted by Rob Kardashian Snapchats (@robphuckedme) on Apr 6, 2016 at 5:41pm PDT

 Rob in Blac Chyna's snapchat

A video posted by Rob Kardashian Snapchats (@robphuckedme) on Apr 6, 2016 at 5:42pm PDT

A video posted by Rob Kardashian Snapchats (@robphuckedme) on Apr 6, 2016 at 5:44pm PDT

 Rob in Blac Chyna's snapchat

A video posted by Rob Kardashian Snapchats (@robphuckedme) on Apr 6, 2016 at 5:46pm PDT

TagsRob Kardashian, Blac Chyna, Rob Kardashian Blac Chyna, Rob Kardashian weight loss, Rob Kardashian weight, Rob Kardashian training