People perform Taijiquan in Luoyang, a city of central China's Henan Province, April 29, 2008. Different cities in Henan held public health-keeping activities to greet the 100-day countdown of the Beijing 2008 Olympic Games on Tuesday. (Xinhua Photo)

People perform fit-keeping dance in Kaifeng, a city of central China's Henan Province, April 29, 2008. Different cities in Henan held public health-keeping activities to greet the 100-day countdown of the Beijing 2008 Olympic Games on Tuesday. (Xinhua Photo)