In what way does regular physical activity benefit chronic disease risk?

Regular physical activity significantly reduces the risk of chronic diseases, which is a key reason why this is the correct answer. Engaging in consistent physical activity promotes cardiovascular health, enhances metabolic function, and strengthens the immune system. These benefits contribute to lowering the likelihood of developing conditions such as heart disease, diabetes, obesity, and some forms of cancer.

Furthermore, physical activity improves the body's ability to utilize insulin and glucose, thereby reducing the risk of developing type 2 diabetes. It also assists in weight management and can lead to improvements in cholesterol levels and blood pressure, which are vital factors for reducing overall chronic disease risk.

The other options do not reflect the well-established benefits of regular physical activity. For instance, increasing susceptibility to illness or promoting sedentary behavior contradicts the extensive research highlighting how being active supports overall health and reduces disease risk. Additionally, stating that it has no effect on health ignores the multitude of positive outcomes associated with regular exercise, making those options less accurate within this context.