Consistent physical activity positively affects the immune system by enhancing its function and resilience. Regular exercise promotes better circulation, which helps immune cells travel throughout the body more effectively. It can also reduce levels of inflammation, improve sleep quality, and decrease stress—factors that contribute to a stronger immune response. Moderate exercise has been linked to a lower incidence of respiratory infections and chronic illnesses. Establishing a routine of regular physical activity is essential for sustaining overall health and strengthening the immune system.