Rob Kardashian Credits Fiancee Blac Chyna for Being His Weight-Loss 'Motivation'

This video is unavailable because we were unable to load a message from our sponsors.

If you are using ad-blocking software, please disable it and reload the page.

Rob Kardashian took to Instagram on Monday to share the progress he's made in his weight-loss journey and praise fiancee Blac Chyna for her help along the way.

"Looking from where I started 298 lbs to my current weight now (248.4 lbs)," the 29-year-old reality star wrote beside a throwback photo of himself and Chyna, 27. "I'm focused and determined to reach my goal weight 200-205 lbs …. Happy I found my motivation."


WATCH: Blac Chyna Pledges to Train Rob Kardashian Herself Every Day for 'Five Weeks'

The photo Rob shared was a paparazzi picture from Feb. 4. At the time, Rob was making a rare public appearance to support his then-girlfriend during her sexy bikini photo shoot for 138 Water by DRE in Los Angeles.

Earlier this month, Rob's bride-to-be announced on Snapchat that she was going to start training her man, setting a target date of her upcoming birthday on May 11 for him to be fully whipped into shape.

WATCH: Blac Chyna Debuts New Hairstyle, Continues to Train Rob Kardashian

"Do you give me permission to train you for the next five weeks, every day?" she asks Rob in one of her snaps.

"Of course," he answers.

Blac Chyna announced the couple's engagement news on April 5. See how they celebrated their engagement in the video below.