Chinese women are participating in the "A4 Waist Challenge," where they have to prove they're paper thin -- literally.
Participants are posting photos of themselves posing with a sheet of A4 paper, which is about the same size as an American piece of printer paper, in front of their waists.
If your waist is not completely covered by the paper, then you lose because apparently you are too fat.
Millions of posts have surfaced on a popular Chinese social media site called Weibo with women gloating about passing the challenge, according to Mashable. And the #A4challenge hashtag has also hit Instagram.
But not everyone is itching to show off their tiny midriffs and some have been quite vocal about their disdain for the controversial challenge.
Seen a lot of people posting this stupid A4 waste challenge. When they fail it they get upset and starve themselves?! But why?? I'm proud of my body! I'm not stick thin and I'm not fat, I'm just me! I'm normal. And I'm quiet happy to be normal. So here, I failed this stupid A4 waste challenge and 0 fucks were given! #loveyourself #stopthenonsense #unrealistic #a4challenge #loadofshit 💁🏼💖😘💋
Yea we didn't pass.. #a4waist #a4challenge #fail #goals #fitness @katieandkoda