This master thesis was written with the aim of assessing the state of nutrition and fitness of students of second grades in primary education. The samples of variables consisted of eight morphological variables: body mass, body height, BMI index, skinfold of the back and of the upper arm, neck circumference, abdominal circumference and hip circumference, as well as five tests to evaluate the state of fitness: lifting the trunk in 30 seconds, standing up pull-up, squat to failure, plank to failure, long jump from place. The samples of respondents consisted of 89 students (52 girls and 37 boys) from the second grades of three primary schools (Primary School "Gornja Vežica", Primary School "Kozala", Primary School "Pehlin") in the area of Rijeka. Before conducting this reaserch, students were informed about the aim and purpose of it, and the tests were adjusted to the age of the students. When processing the data and analyzing the results, the morphological variables of body height, body mass and BMI index determined that students of both sexes in this study were overweight. The sum of the morphological variables of the skin folds of the back and upper arm showed there are risk indicators of overweight and obesity in the development of children. Also, in these variables it is visible that there are differences in the percentage of fat depending on the sum of the values of skin folds between boys and girls. By processing the data of hip circumference and abdominal circumference, the WHR index was figured out, with which it can be seen that both sexes have a WHR index value higher than the average, and thus it is concluded that both girls and boys in this study tend to obesity. Regarding the analysis that represents the state of fitness between the students, it was shown that the students tested on this study, although they tend to obesity and have excessive body weight, still have satisfactory fitness and fitness abilities. Studying the obtained results of the determined state of the students, I created my own annual performance curriculum for the 2nd grade of elementary school, with which I showed which kinesiology content should be used in the 2nd grade of elementary school in order to maintain the previous fitness habits and the fitness achieved. Conclusion of my master thesis is although children have a developed need for physical movement, they still need to be guided during their development and pointed out to them about the consequences of obesity.