The current problem today is the obesity of preschool children. Obesity is the end product of inactivity and reduced movement of children. The reasons why this occurs are numerous. Proper nutrition, quality rest, and physical activities are important for children's development and growth. Parents are a key factor influencing the establishment of the quality growth and development in preschool. Children spend most of their free time with their parents, who must ensure quality free time.The research in this paper examines the parents opinions towards the physical exercise of older preschool children. The sample of respondents consists of 33 children and 66 parents from three preschool groups from the Maslačak Kindergarten in Garešnica. As a research instrument, a survey was used to examine parents' opinions towards children's physical exercise. Survey was also used to gain insight into the parents BMI and see if it is associated with the BMI of children. The research should answer the set hypotheses: H1 - parental activity affects children's activity and H2 - parents consider physical activity important for children's growth and development. The end result of the research leads to interesting information. H2 was confirmed because parents consider physical exercise important for children's growth and development, and H1 was partially confirmed, i.e. that parental activity influences children's activity.