A Chinese student wraps her arm around her waist and touches her belly-button to attempt a Belly-button challenge at a school in Luoyang city, centr Stock Photo - Alamy

Belly chinese hi-res stock photography and images - Alamy

Chinese Student Wraps Her Arm Her Waist Touches Her Belly – Stock

Belly chinese hi-res stock photography and images - Alamy

Arm around waist hi-res stock photography and images - Alamy

Arms around waist hi-res stock photography and images - Alamy

One girl tries her hand at the belly button challenge

Waist wars: China belly button challenge gets trending - BBC News

Arm button hi-res stock photography and images - Page 4 - Alamy

Arms around waist hi-res stock photography and images - Alamy

Test your figure by touching your belly button[1]- Chinadaily.com.cn