Objective To explore the impact of modern life style on the physical fitness of preschool children and the relationship between them. Methods Based on 2010 China National Health Survey in Shanghai,a total of 7 643 preschool children aged 3to 6years old from l8 districts were sampled.The feeding practice in the postnatal 4months,the main caregivers at home,daily sleep,whether to participation in sports and art classes,father and mother to do physical exercises or not,7independent variables were selected as t...