What is likely to improve due to regular physical activity?

Engaging in regular physical activity is known to have numerous positive effects on overall health, one of which is improved functioning of the immune system. Regular exercise can enhance the circulation of immune cells in the body, improve the efficiency of the immune response, and reduce the risk of chronic diseases. It helps to manage stress hormones, which can otherwise suppress immune function, and promotes healthier bodily systems that contribute to a robust immune response.

While other options mention important health aspects, they don't encompass the broad spectrum of benefits provided through consistent physical activity. For example, while cholesterol levels can improve with exercise, choosing physical activity as the sole intervention for managing cholesterol overlooks other lifestyle factors that play a role. Mental health is indeed positively influenced by exercise, but suggesting that it is the only aspect to improve fails to recognize the comprehensive benefits physical activity offers. Muscle soreness, on the other hand, is generally a temporary condition that may improve over time with regular exercise, but it is not a primary benefit of engaging in physical activity. Instead, improved immune system function stands out as a key long-term consequence of regular physical exercise.