Stone Lock fitness competition held in Nanjing, China's Jiangsu

A contestant stands upside down on a stone lock in a Stone Lock fitness competition in Yinxiang Community of Jiangning District of Nanjing, capital of east China's Jiangsu Province, Oct. 6, 2017. Nearly 400 contestants from 19 teams attended this competition on Friday. (Xinhua/Li Wenbao)