The A4 challenge encourages women to use an A4 sheet of paper as a standard to measure their waist.
How wide is a sheet of A4 paper? Just 21 centimetres.
Women, who are a part of this trend, have claimed that an A4 waist size is a healthy and attainable aim.
However, critics have slammed this bizarre trend, they have said it is unrealistic and unhealthy for women to consider this a ‘fitness’ goal.
Also, most boys have shunned this waist challenge. They say it’s impossible for them to have such a small waist.
And some are even making fun of it.