In contemporary business, human resourses represent one of the primary factors contributing to a company's competitiveness and profitability. As such, factors that directly or indirectly influence employees's job performance constitute the fundamental basis for effective human resource management and development. Accordingly, this master's thesis has explored and critically examined relevant literature on the impact of sports or physical activities on employee work capacity. Additionally, for the purposes of this thesis, two online surveys were conducted involving 100 respondents. Through survey research, it was determined to what extent regular engagement in various sports or physical activities affects the work capacity of employees, considering their basic demographic characteristics. The conducted research resultet in findings that do not conclusively confirm a positive impact of physical activities on employee work capacities, nor do they completely refute it. Most of the obtained results cannot be adequately interpreted due to the lack of achieving a satisfactory level of statistical significance, while interpretable results are diverse and vary in their findings. Taking info account previous empirical and theoretical knowledge regarding the impact of sports and physical activities on work capacity, as well as the results of the analysis of the conducted online surveys, it can be concluded that physical activity genetally has a positive influence on employee work capacity and job performance. Therefore, employers should devise adn implement appropriate measures to encourage their employees to engage in sports or suitable physical exercise, all with the aim of increasing employee productivity, as an important prerequisite for the sustainability and future development of the company.