Background. The aim of the research is to analyze the changing exercising frequency, the wellbeing, the mental health, and the social relationships before and during the curfew of COVID-19's first wave.Material and methods. The data collection was May-June in 2020 via an online questionnaire survey amongst the sportsmen and professionals in the sports sector. We used descriptive and inferential statistical methods with the SPSS 27.0 software (Chi-square test, Wilcoxon, Mann-Whitney U and Kruskal-Wallis tests).Results. The respondents were 44.17% female and 55.83% male. The average age was 36.36±16.52 years. We classified the sample into four sectors: elite sportsmen (20.60%), outdoor sportsmen (34.29%), sports professional (28.21%) and multiple roles (16.90%). There was a significant difference at the exercising frequency before and during the curfew between the sectors (p<0.001). The well-being, the mental health and the social relations did not show any significant differences. Regarding physical activity, there were decreases in every category:-268.36 minutes weekly average in the elite sportsmen, -194.90 minutes weekly average in the outdoor sportsmen and -250.33 minutes weekly average in the multiple roles' category (p<0.001).Conclusions. We conclude that the curfew of the COVID-19 pandemic had a major impact on the exercising frequency and physical activity amongst the sportsmen and professionals in the sports sector.