Obesity is a disease of the modern world. Due to the sedentary and stressful lifestyle to which every individual is exposed daily, the necessary physical activity and proper nutrition are more often neglected, and such a lifestyle promotes the appearance and development of obesity. It is a worrying fact that the occurrence of obesity in children of early school age has been increasing in recent years. Many studies have shown that a very large percentage of children in the world belong to the group of obese or overweight. By comparing children of preschool age and children of early school age, it was proven that obesity occurs less often in children who have not yet started school. The reason for this may be the fact that after starting school, children replace playgrounds and parks with school benches, and because of their school obligations, they reduce their daily physical activities. The aim of this paper was to offer an experimental program for the prevention of obesity in children of early school age for a duration of three months, which would affect the morphological characteristics of students. The following morphological variables were measured with the students at the beginning and at the end of the program: body mass, body height, body mass index, body fat percentage based on measurements of back skinfold and upper arm skinfold. In addition, the functional and motor abilities of the students were checked with the tests. In addition to the experimental group of students, the research also included a control group that did not participate in the program. After the final measurement of the students, the hypothesis was confirmed that the children of the experimental program will have better morphological characteristics after the implementation of the program than the children who participated in regular classes of Physical and Health Education.