Rob Kardashian, Blac Chyna, Gym, Diet, Fitness Rob Kardashian is feeling motivated. With just a few weeks until fiancée Blac Chyna's due date, the dad-to-be is making a public commitment to shed his "pregnancy weight." "Oh yeah we snapping back," he wrote on Instagram with a photo split of him looking trim with Chyna in a bikini. With the clock counting down to their first daughter's arrival, Kardashian sounds more motivated than ever to get back into his best shape?and many are on his side.