Sun Yang shows up as school's volunteer teacher in Dehui, Jilin (4/8)

China's Olympic swimming champion Sun Yang exercises during a PE class in a primary school in Dehui, northeast China's Jilin Province, China, Sept. 26, 2013. Sun Yang showed up as a volunteer teacher in the school Thursday, bringing professtional physical education classses to over one hundred children of the school. (Xinhua/Xu Chang)