participate in "backhand" People who feel navel challenge need backhand to bypass their backs and then touch their navel. (page screenshots) 
thousands of people have uploaded photos of themselves to the "backhand touch navel" on Chinese social media. (page screenshot)
it is said that if you challenge success, prove that you have a good figure. (web page screenshot)
International Online Edition: according to the British "mirror" and "Daily Mail" June 11th comprehensive report, China's social network is being called the "backhand touch the navel" challenge, only a simple test can show your good figure, and whether you need to lose weight. At present, this test has attracted at least 130 million participants.
since the "backhand navel" challenge, thousands of people have uploaded their photos to the Internet, showing their backhands around the waist after the navel. As of 10, the challenger has reached 130 million and has become the hottest topic on micro-blog.
many Chinese celebrities have participated in the challenge and uploaded their photos. If you can successfully complete the challenge, prove that you have a good figure. If not, it shows that you are going to lose weight. Chinese netizens claim that they came to the conclusion from "American scientific research", but have not yet been confirmed.
this challenge is not only a patent for women with small waisters, but some men with beer belly have successfully completed the challenge, and their photos are on the Internet.
but experts say this challenge does not mean that you have super healthy body. If your arm is long enough or your body is flexible enough, you can complete the challenge. A fitness coach said he could not complete the challenge.
this new social activity has aroused heated debate among foreign netizens. In the commentary area of the daily mail, netizens excitedly discussed the beautiful women who showed good looks and announced the results of their tests. Some netizens laugh at themselves with big belly and arms. "People in Europe and America do this more difficult, because they are generally too fat, and the Asians are slim, and it's easier to do this," the netizen said humorously. But there is also a view that this challenge is "very crazy" and even childish.