At a school sports meet in southeast China's Fujian Province, a group of boys stood beside the track, pointing their fingers toward a sprinting classmate. As he passed by, he raised his hand in return, completing a wordless exchange of camaraderie.

The spontaneous gesture has caught on online, inspiring students at other schools to join in. As one commenter put it: "Youthful spirit is non-renewable. May you keep running forward."