Physical activity contributes to cardiovascular health by improving heart function, enhancing blood circulation, and lowering blood pressure. Regular exercise strengthens the heart muscle, allowing it to pump blood more efficiently. Additionally, it increases levels of high-density lipoprotein (HDL) or "good cholesterol," while reducing levels of low-density lipoprotein (LDL) or "bad cholesterol." Physical activity also aids in maintaining a healthy weight and reducing stress, both of which are beneficial for heart health. Collectively, these factors contribute to a lowered risk of heart disease and improved overall cardiovascular function.