CHONGQING, CHINA - APRIL 29:   Pupils play during a nationwide activity aimed at building up the health of youths April 29, 2007 in Chongqing Municipality, China. The education ministry has urged schools nationwide to pay more attention to sports and lighten children's burden by reducing homework and increasing exercise. China now has the world's second highest myopia rate among schoolchildren, blamed in part on too much study, and obesity among the young has become a major health concern. Getty Images logo Getty Images 31 months ago

CHONGQING, CHINA - APRIL 29: Pupils play during a nationwide activity aimed at building up the health of youths April 29, 2007 in Chongqing Municipality, China. The education ministry has urged schools nationwide to pay more attention to sports and lighten children's burden by reducing homework and increasing exercise. China now has the world's second highest myopia rate among schoolchildren, blamed in part on too much study, and obesity among the young has become a major health concern.