A sedentary lifestyle can significantly affect mental health by contributing to increased feelings of anxiety, depression, and stress. Lack of physical activity can lead to decreased endorphin production, which negatively impacts mood. Additionally, physical inactivity is often associated with social isolation and a decline in cognitive function. Incorporating regular exercise can improve mental well-being by elevating mood, reducing anxiety, and enhancing overall energy. Thus, staying active is crucial for both physical and mental health.