Women are required to take photos of themselves with a piece of A4 printer paper in front of their waists. The width of an A4 paper is eight inches, and women are trying to prove that their waistlines are narrower than that.
The A4 waist challenge started in China around February and has seen hordes of Chinese women taking to their Weibo accounts to show off their trim waistlines.
Since the challenge took off, Weibo now has millions of photos with the hashtag #A4waist. It was only a matter of time before this worrying challenge influenced women in other parts of Asia to take part in it too.