In response to the absurd A4 waist challenge that swept Chinese social media recently, people with a better grasp of beauty have called it out with their own variations on the hashtag. To quickly re-ignite your anger, this is an example of the challenge that women were initially posting and lauding.

A4waste😃 #a4waist #spring #march #keepfit #fitness

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People would post photos with an "A4" sheet of paper (roughly 8 ×11 inches), the goal being to have a waist so tiny it could fit behind those minuscule dimensions. 

Sources: Runway Riot