Physical activity has a significant positive correlation with immune function. Regular exercise helps to enhance circulation, which allows immune cells to travel more efficiently within the body. It can also decrease inflammation and promote better stress management, both of which are beneficial for the immune system. Studies show that moderate exercise supports immune health by increasing the production of antibodies and improving the body's ability to respond to infections. However, excessive or intense exercise without proper recovery may lead to immune suppression, highlighting the importance of balance in physical activity.