Unlike many of the social media challenges that emerge, this one you can actually try at home.

That's not to say, however, it's not without its risks.

Yes, a new internet craze has emerged that involves touching your belly button by reaching behind your back and around your waist. The activity is then, of course, captured and posted online with the hashtag #bellybuttonchallenge.

The belly button challenge began on Weibo, the Chinese equivalent to Twitter, and tens millions of posts featuring the hashtag have since been posted.

Anyone who can successfully reach their belly button by wrapping their arm around their back is incredibly slim, boasting tiny and toned stomachs. 

We have all tried it here in SHEmazing! and it seems it’s largely down to your flexibility and arm length, rather than just your waist size.

For example, a photo uploaded by a more curvaceous male blogger touching his belly button took Weibo by storm.

More than 2,600 people 'liked' his effort, with one tweeting: "You go Buddha! Show the skinny girls how it's done."

According to Mail Online, users have claimed that the concept came from research by US scientists. In their study, the researchers suggested women who can complete the belly button challenge have 'good' bodies, But this research has not yet been sourced or cited – and experts say that actually, there are a number of variables that can affect your success.

We hope this is a trend that dies down soon as some people completing the challenge are beginning to use hashtags like #imnotfat, leading to concerns that those who cannot complete the challenge may feel inferior.