Research on the latent structure of tests of motor abilities of third-grade students was conducted on third-grade students who attend the elementary school "dr. Jure Turić" in the town of Gospić. The third grade is attended by 20 male and 40 female students, and according to their age, they are divided into the range of 8 to 10 years.The research participants regularly attended Physical Education and Health Education classes. The aim of the research was to determine the differences in anthropological characteristics for determining the structure of tests of motor skills of third graders. The sample of variables used in the research consists of six tests that cover the students anthropological characteristics. During the research, the obtained results were processed using the methods of descriptive statistics and tests of motor skills were checked. Factor analysis using the method of principal components and the application of the GK-criterion were used to extract factors transformed by vertical rotation according to the Varimax normalized criterion, and the number of principal components was determined. The results determined the differences between male and female students in classroom teaching in the area of latent dimensions of motor ability tests. The results indicate that the statistical variables used in the research do not deviate significantly from the normal distribution. The research determined two latent dimensions. The first latent dimension is the latent structure of motor ability tests for flexibility, and the second latent dimension is the latent structure of motor ability tests for explosive strength.