Concerns have been raised about the levels of physical activity of young children and its association with children’s development and risks such as obesity. What are the factors in relation to the level of physical activity of young children? How to devise strategies that give children adequate physical play at school and at home? The Hong Kong Chapter of Pacific Early Childhood Education Research Association (PECERA) organized a seminar on “Physical Activity of Young Children during Preschool and Non-Preschool Time” on 27 September 2010 (Monday). Prof. Bik Chow of the Department of Physical Education, Hong Kong Baptist University, who was also the winner of the “2008 Metzler-Freedman Outstanding Paper Award” for best paper in Journal of Teaching in Physical Education for the Year of 2008, was invited to be the guest speaker. She talked about the trend of obesity among children and its relationship to health, the physical activity levels of young children in HK and strategies to raise their activity levels. The seminar was very well received by the audience which included academics, ECE practitioners and teachers and parents.