Purpose: Covid-19 is a viral infection that affects either the respiratory system or the other systems. Studies about the effects of Covid-19 on physical activity are still scarce. This study aims to compare the changes in the physical activity levels of patients before and six months after Covid-19 in Turkey. Methods: One hundred and six participants that have been six months after Covid-19 contraction were included in the study. Along with the Patient Assessment Questionnaire, the International Physical Activity Questionnaire Short Form was used to assess physical activity energy consumption (vigorous-intensity physical activities, moderate-intensity physical activities, walking, and total physical activities). Results: Participants became either less physically active or more sedentary six months after Covid-19 (p=0.019). Vigorous-intensity physical activity levels were significantly decreased (Mean±SD: 341±854 vs. 109±331 Metabolic Equivalent Task minutes/week, p=0.015), and perceived fatigue during exercise was significantly increased between before and six month after infection (Mean±SD: 4.76±2.17 vs 6.17±2.27, p=0.001). Participants who had dyspnea (n=12) during the period of Covid-19, did more moderate-intensity physical activity (p=0.020) and walking (p =0.021) after Covid-19, compared to those who had not. Conclusion: Particularly changes in vigorous-intensity physical activity levels and perceived fatigue during exercise were seen in Covid-19 infected patients. We recommend supporting gradually increased tailor-based exercise programs by health professionals in public health agencies, not only for protecting the individuals from Covid-19 outcomes, but also for returning to their preinfection fitness levels.