Recently, A4 waist goes viral on the Internet. After previous trends of“touching the belly button from behind” and “putting coins on collarbone”, A4 waist has become the latest fashion to show off you perfect body shape on social media. A4 waist refers to waist with its width less than 21 cm (the width of an A4 paper).
Chinese popular stars can’t wait to show off their A4 waists.
Actress Yuan Shanshan.