What is the primary benefit of cardiovascular endurance training?

The primary benefit of cardiovascular endurance training is to increase heart and lung efficiency. This type of training helps the cardiovascular system to work more effectively by improving the heart's ability to pump blood and enhancing the lungs' capacity to exchange oxygen and carbon dioxide. When a person engages in regular cardiovascular exercise, such as running, cycling, or swimming, they strengthen their heart muscle, which allows it to pump more blood with less effort. This improved efficiency means that the body can deliver oxygen to working muscles more effectively during physical activity, leading to better overall endurance and stamina.

In contrast, while improving muscular strength and enhancing flexibility are important components of physical fitness, they are not the primary outcomes of cardiovascular training. Additionally, decreasing body weight can be a result of various exercise programs and dietary changes, but it is not a direct benefit of cardiovascular endurance training specifically. The focus of this type of training is primarily on the efficiency of the cardiovascular and respiratory systems, making choice C the correct answer.