Physical activity refers to any form of bodily movement or exertion that requires energy expenditure. This can include a wide range of activities such as exercise, sports, dancing, gardening, walking, and even housework. The goal of physical activity is generally to improve health and fitness by strengthening muscles, improving cardiovascular function, increasing flexibility, and reducing the risk of chronic diseases like obesity, diabetes, and heart disease. Physical activity can also have mental health benefits such as reducing stress, anxiety, and depression, while also promoting social connections through group activities or sports teams.