This graduation paper is based on the study and reading of professional literature and numerous scientific researches related to the relationship between functional capacity and obesity indicators. The aim of this paper is to determine, by analyzing the collected data, whether there is a correlation between functional capacity and obesity. Functional abilities refer to the efficiency of basic functional mechanisms, namely aerobic capacity and anaerobic capacity. Aerobic capacities and anaerobic capacities are important mechanisms for the organism's endurance. They are stimulated by the individual's physical activity and are partly innate, but functional abilities can be trained and practiced in order to improve endurance. Tests with which we can test students' functional capacities can be on field or laboratory. Obesity is a disease that includes an excessive amount of body fat, and is determined by numerous anthropometric measurements. Obesity is determined by measuring body mass index (BMI), measuring waist circumference and the ratio of waist circumference to hip circumference. Among students, obesity is an increasingly common phenomenon, which has been proven by numerous researches and measurements of obesity indicators. Obesity is a complex disease that, if diagnosed in childhood, can carry the burden of disease in adulthood. In order to increase the trend of obesity, which at the same time reduces functional abilities, numerous programs and strategies have been organized for the purpose of intervention in the spread of the disease, not only in the Republic of Croatia, but at level of Europe. In the Republic of Croatia, in 2016, the program "Live healthy" was launched in order to improve the health of the population. Since today's sedentary lifestyle has helped in the progression of the reduction of functional abilities and the development of obesity, the basic starting point in the prevention of problems is physical activity and proper nutrition. The need for movement and physical activity is inevitable for maintaining both the health of the organism and functional capacities that can only progress.