The relationship between fitness and immune function is notable, as regular physical activity can enhance the body's immune response. Exercise promotes circulation, which helps immune cells move more efficiently throughout the body, improving their ability to detect and combat pathogens. Furthermore, moderate-intensity exercises, such as walking or cycling, have been shown to reduce inflammation and support overall immune health. However, excessive exercise may have the opposite effect by temporarily suppressing immune function, highlighting the importance of balance in workout regimens for optimal overall health.