It’s no secret that the KarJenners are fans of waist training. The famous sisters have all snapped pics for Instagram wearing their Waist Gang Society trainers from waist training guru Pre Madaonna. Interestingly, they were first introduced to Pre Madonna’s magical waist trainers by way of Blac Chyna. Allegedly, Chyna and Pre Madonna’s friendship had a fall out after the she and Rob Kardashian broke up and Pre continued to work with the family.

Well, after giving birth to daughter, Stormi Webster, last month Kylie Jenner is on a mission to get her waist snatched. The 20 year-old mom shared a photo wearing one of Pre’s trainers with the caption, “my girl @premadonna87 hooked me up with the @waistgangsociety snap back package.”

Of course she followed up the message with “#Ad” because if there’s one thing the KarJenner ladies are good at besides snatching waists, is collecting coins. BUT now Rob has joined his sisters’ love of waist training on his journey to get SKINTY!

He tweeted his support for the waist training movement by promoting Pre Madonna’s new video ad and then retweeting her post of pre-preggo Khloe modeling one of her designs. Are you waist training too, Rob?

The new dad has a goal to return to the “old” Rob AKA hot Rob this year, specifically by the time Khole Kardashian gives birth. His very pregnant sis challenged him to lose 15 pounds by the time she gives birth.

Considering Khlo can pop any day now (she’s due in 2 weeks!) that’s a tall order, but Rob has been working on his transformation since the December and has reportedly already lost 10 pounds. Recent birthday pics of a much slimmer Rob with his and Chyna’s daughter, Dream Kardashian, are proof he’s kicking this challenge’s butt.

Time is ticking though! Khloe’s latest maternity shot shows her growing belly.

Waist training, more maternity shoots and baby mama drama—are you keeping up?