The aim of this paper is to show differences in physical activity of children in Krapina-Zagorje County and city of Zagreb, based on the conducted research. The child should be active most of the day because that is a basic need necessary for optimal growth and development. Physical activity reduces the risk of being overweight and leads to healthier and stronger internal organs and improved mental functioning. In that way children develop positive image of themselves and become aware of their abilities. Preschool is the best time to react so that physical activity becomes a daily routine for children because later in childhood it is difficult to influence someone's attitudes. The research was conducted in Kindergarten Rožica in Veliko Trgovišće and in Kindergarten Iskrica in Zagreb. The study involved 50 children aged 6-7. The questionnaire was filled out by the children's parents and it contains data on the age, weight, height of the children, physical activity (training and leisure time), and time spent in the activities. The given results show that there is a significant difference in playing sports between the respondents. Insufficient physical activity places children in the category of being overweight and obese. The comparison also showed that respondents spend time in physical activities, apart from training, in accordance with the recommendations of the World Health Organization. There is no significant difference in the representation of activities among respondents.