This looks painful.

Khloe Kardashian is taking her health and fitness very seriously these days, but is also one of the celebs who have jumped on the waist-training trend for a little extra help squeezing their midsection into a smaller, and smaller space.

The 31-year-old posted a shocking new waist training Instagram on Tuesday, writing, "Im obsessed with the gym but a little extra help never hurt nobody @waistgangsociety and @premadonna87 keep my waist snatched and posture perfect. Once you try it, you will become obsessed!!! Head over to whatsawaist.com the ONLY place to get your waist trainer!!!"

WATCH: Khloe Kardashian's Waist Training Is Working Out

Tyga's ex Blac Chyna also posted a new waist-training pic, writing, "Waist training of course in my @instacurve_ Trying to get into some trouble later ... What's Good?"

WATCH: Khloe Kardashian Shares Super Skinny Selfie: 'People Love to Call Me the Fat One'

Ow, ow, ow, owww...

"My fitness journey will be a life long journey," Khloe wrote along with a selfie back in February. "Fitness is not about being better than someone else… It's about being better than you used to be. I'm not where I want to be and who knows if I ever will be. But I am healthier than ever and due to my consistent workouts, I am slowly seeing results."

PHOTO: Kim Kardashian Is 'Waist Training' With A Super-Tight Corset

While it seems to be becoming more popular, not everyone in Hollywood is a fan of waist training! Actress Kate Winslet seemed viscerally opposed to it when ET talked to her in June.

WATCH: Waist Training Gone Too Far? Kim Zolciak Loses 4 Inches Off Her Already Tiny Waist

"Why would you do that?!" Kate said. "Why would anyone willfully put themselves into a corset?"

What do you think of waist training?

WATCH: 8 Celebrities Who Waist Train

Watch below.