## 1 Introduction  
Community-acquired pneumonia (CAP) is a major reason for hospitalizations, with nearly 20% of patients returning to the hospital within 30 days post-discharge [1]. During hospitalization, reduced physical activity and bed rest are frequently observed. In patients with CAP, activity is restricted due to external factors like intravenous antibiotic therapy and oxygen support, as well as internal factors such as hypoxemia and fatigue [2]. Physical activity plays a fundamental and essential role as a cornerstone in the comprehensive treatment of patients who suffer from respiratory diseases, including those diagnosed with community-acquired pneumonia (CAP) [3]. Engaging in physical exercise has been shown to improve overall health outcomes, promote better respiratory function, and enhance recovery in individuals affected by such conditions. According to a study conducted by [PERSON] et al., a significant association was found between a sedentary lifestyle and increased risks of mortality and hospital readmission in patients who had been hospitalized due to CAP. The researchers observed that individuals who remained physically inactive during their hospitalization or after discharge exhibited higher chances of experiencing negative health events, underscoring the critical importance of minimizing sedentary behavior. These findings highlight the need for targeted interventions aimed at promoting physical activity during and following hospitalization for respiratory infections, such as CAP [4]. Sedentary behavior is defined as any form of activity that requires very low levels of energy expenditure and is typically characterized by prolonged periods of sitting or lying down, during which there is minimal or negligible physical movement. This type of behavior encompasses a wide range of daily activities, such as watching television for extended hours, working on a computer, reading books or magazines, or spending long periods seated while commuting in a car or public transportation. Although sedentary behavior is frequently associated with leisure-related past times that involve little physical engagement, it is equally common in professional settings, where tasks often necessitate extended periods of sitting, such as those performed by office workers or individuals in administrative roles [5]. Research has consistently shown that prolonged sedentary behavior, when maintained over time, can have significant detrimental effects on health. Specifically, it has been linked to an increased risk of developing chronic illnesses, including type 2 diabetes, obesity, and various forms of cardiovascular disease. Furthermore, excessive sedentary habits have been associated with a higher likelihood of experiencing reduced life expectancy, as they can elevate the overall risk of all-cause mortality. These findings underscore the urgent need for public health initiatives aimed at reducing sedentary time and encouraging more active lifestyles, both in the workplace and during leisure hours [6; 7]. In addition, there is substantial evidence indicating that sedentary behavior serves as an important risk factor for the progressive functional decline observed in individuals suffering from respiratory diseases. Extended periods of physical inactivity can lead to a host of adverse effects, including weakened skeletal muscles, decreased lung capacity, and a compromised immune system. These negative outcomes collectively contribute to poorer health status and a higher likelihood of complications in patients with respiratory illnesses. Prolonged sedentarism makes individuals more vulnerable to reduced physical performance and can further exacerbate disease progression [8]. Studies conducted on other respiratory conditions, such as Chronic Obstructive Pulmonary Disease (COPD), have shown that sedentary lifestyles are closely linked to worsening symptoms, decreased functional ability, and reduced exercise tolerance at the time of hospital admission, regardless of the underlying severity of the disease itself.