Children in Wuhan, Hubei Province practice aerobics with a trainer on July 15, 2011. Many have signed up for the 28-day weight-loss camp this summer. The youngest participant is only 8 years old, and the heaviest child weighs more than 150kg. [Photo/Xinhua]

Children in Wuhan, Hubei Province, practices hula hoop on July 15, 2011. Many have signed up for the 28-day weight-loss camp this summer. The youngest participant is only 8 years old, and the heaviest child weighs more than 150kg. [Photo/Xinhua]

A child in Wuhan, Hubei Province exercises on July 15, 2011. Many have signed up for 28-day weight-loss camp this summer. The youngest participant is only 8 years old, and the heaviest child weighs more than 150kg. [Photo/Xinhua]