Teaching methodology is an interdisciplinary science that connects the findings of all disciplines that investigate the educational process. This paper explains the interdisciplinary nature of education, with a special focus on the methodology of kinesiology and the methodology of the Croatian language teaching, which determine strategies, methods, models, and procedures for designing and implementing the teaching process in physical education and the Croatian language. Physical education positively influences the development of morphological characteristics as well as motor, functional, and cognitive abilities that affect the development of initial literacy, learning, and mastery of the Croatian language. Since movement and learning are interconnected, quality physical education can contribute to the students' alertness and energy levels, which affects overall academic achievement and motivation. Therefore, it is expected that physical activity immediately before the Croatian language class will have a positive impact on student motivation and achievement in Croatian language classes. The main goal of this research was to examine whether the physical education class can be a predictor of success in Croatian language classes. The research was conducted in two fourth-grades. One class had Croatian language classes as the first period for five days, while the other class had physical education classes as the first period and Croatian language classes as the second period during the five day period. It was found that there is a statistically significant difference in the total number of points on the knowledge assessment test on three out of five days and in the overall average number of points on the knowledge assessment test for all five days between the two groups. The class in which physical and health education classes were held immediately before Croatian language classes achieved statistically significantly better results. t was not confirmed that there is a statistically significant difference between the two classes in overall perceived knowledge, interest and understanding of the material and that the class which had physical education classes immediately before Croatian language classes scored statistically significantly more points during self-assessment on all variables.