Exercise serves as a preventive measure for chronic diseases by enhancing overall health and improving bodily functions. Regular physical activity helps manage weight, regulate blood pressure, and improve cholesterol levels, reducing the risk of conditions like heart disease, type 2 diabetes, and certain cancers. Exercise also strengthens the immune system, improves insulin sensitivity, and promotes better mental health, all of which contribute to disease prevention. Moreover, engaging in consistent physical activity can enhance longevity and lead to a better quality of life as one ages.