"Looking from where I started 298 lbs. to my current weight now 248.4 lbs. I'm focused and determined to reach my goal weight 200-205 lbs.," Kardashian, 29, wrote on Instagram Monday along with a photo of himself with fiancée Blac Chyna.
"Happy I found my motivation," he captioned the picture which was originally taken in early February.
Blac Chyna, 27, has not only become Kardashian's bride-to-be but she's also become his personal trainer. The mother of one documented yet another workout session on her Snapchat Monday, proving he's not slacking off one bit.
"Working on the mind, working on the body, working on that soul," Kardashian said while exercising on the revolving staircase as recorded for Snapchat by Blac Chyna.
Day 3 consisted of "three different cardio exercises" for Kourtney, Kim and Khloé brother.
Blac Chyna previously announced that she would be taking initiative to help her man continue to lose weight, training him for the next five weeks every day to whip him into shape for her May 11 birthday.
In December, Kardashian was diagnosed with diabetes after battling depression and gaining 100 lbs.