Activities that improve cardiovascular endurance include running, cycling, swimming, and aerobic exercise classes. These activities elevate the heart rate and enhance the efficiency of the cardiovascular system, improving overall heart and lung function. Engaging in high-intensity interval training (HIIT) can also be effective for building endurance in a shorter time. Consistency is key, as regular participation in these activities leads to adaptations in the body that enhance endurance. Incorporating a variety of activities helps maintain interest while challenging different muscle groups for comprehensive fitness improvement.