Students practice acrobatic skills in the Sichuan Provincial Art School July 14, 2008 in Chengdu of Sichuan Province, China. More than 50 children aged 7 to 15 major in acrobatics at the school, and will be trained at least six years before they get a chance to enter acrobatic troupes. China's tradition of acrobatics is believed to date back over 4,000 years and has gained international recognition for performers' skills. (Photo by China Photos/Getty Images)