A woman poses for a selfie with a row of coins on her collarbone. Photo: sina.com

Chinese social media has coined yet another unusual challenge for people to show off their slim figures.

Thousands of Net users have uploaded selfies this week to show how many coins they can place in a row on their protruding clavicles.

The challenge has seen over 4 million hits on Sina Weibo  and over 1,000 different photos have been online as of 3 pm Wednesday, China News Service reported.

Other photos, perhaps ranging in degree of seriousness, show people with various objects on their collarbones, such as tomatoes, eggs, fruit, a coke can, a phone and a bar of soap.

"I have a perfect body, so why not show it off? Anyway, it's not like playing this game will break my collarbone," one participant wrote.

The trend comes just one week after the 'belly button challenge,' in which participants tried to touch their navels with an arm around their backs to show off their waistlines.

Even Chinese celebrities, including actress Yang Mi, posted such photos.

While Many on social media expressed their clavicle envy, some reminded that keeping healthy is more important than having a stick-thin figure.

"Could we find something for fat people to show off their looks someday?" a Net user wrote.