In the master's thesis, we researched how the COVID-19 epidemic affected the physical/sports activity of students of the Faculty of Education at the University of Ljubljana. In the theoretical part of this master’s thesis, we presented the importance of regular physical/sports activities, wrote down various definitions of physical/sports activities, described students' physical/sports activity, reviewed the structure of sports activities at Slovenian universities, and gave recommendations regarding the amount and intensity of physical/sports activities. In the following, we described the COVID-19 pandemic and the COVID-19 disease, listed measures of the Republic of Slovenia during the COVID-19 epidemic, and presented how the epidemic affected the lives of students. In the empirical part. 41 students participated from the Department of Elementary Teaching at the Faculty of Education in Ljubljana. We researched how often students performed physical/sports activities before and during the COVID-19 epidemic, what factors had the greatest positive effect on their physical/sports activity during the epidemic, and how the epidemic affected general well-being, body mass index (BMI), self-assessment of physical/sports activity, and physical performance of students. The results showed that the period of the COVID-19 epidemic had a positive effect on the frequency of physical/sports activities of students who were less often physically/sports active before the epidemic than during the epidemic. The results also showed that during the pandemic they were more intensely and longer physically active in the 2nd month than in the 1st month. The students also confirmed the progress between the 1st and the 2nd month of the epidemic with better self-assessments regarding their physical capabilities and better performance on the performance test achieved in the 2nd month of the epidemic. Between the 1st and 2nd months of the COVID-19 epidemic, no statistically significant differences in the frequency of physical/sports activities were detected in normally heavy students while statistically significant differences occurred in overweight students. Overweight students were more often physically/sports active in the 2nd month of the epidemic than in the 1st month of the epidemic. For normal and overweight students, we found no statistically significant differences in the average BMI in the 1st and the 2nd month of the COVID-19 epidemic. We found that free time, weather, and society had the most positive impact on physical/sports activities in both the 1st and 2nd months of the COVID-19 epidemic. Less important factors were free sports activities and an exercise diary even though the positive impact of exercise diary increased by almost one mark in the 2nd month of the epidemic. With the exercise diary, we wanted to encourage students to exercise further.