Final answer:
Moderate-intensity physical activity boosts immunity by decreasing the risk of upper respiratory infections and lowering death rates from certain cancers, while also reducing the likelihood of obesity and type 2 diabetes. Regular exercise also benefits overall health by improving cardiovascular and muscle fitness, bone density, and aiding in weight management.
Step-by-step explanation:
Engaging in moderate-intensity physical activity can have numerous benefits for the immune system. Studies have shown that regular exercise can lead to a decreased incidence of upper respiratory tract infections. Additionally, routine physical exercise has been associated with reduced death rates from certain types of cancer, such as breast and colon cancer. Furthermore, staying active helps in reducing the risk of developing type 2 diabetes and obesity.
Beyond these benefits, moderate-intensity exercise improves overall health by increasing cardiovascular and muscular fitness, enhancing bone density and strength, boosting cognitive function, and aiding in both weight loss and maintenance. The U.S. Department of Health and Human Services recommends adults engage in aerobic physical activity for at least 2.5 hours at moderate intensity each week. Such activity can lead to increased life expectancy and improved quality of life.
Therefore, by enhancing the immune system and promoting better health, moderate-intensity physical activity serves as a crucial component in maintaining one's well-being, preventing chronic diseases, and supporting a strong and reliable immune defense.