Which component of fitness includes activities that improve cardiovascular endurance?

The cardiovascular component of fitness is specifically geared towards activities that enhance cardiovascular endurance. This component focuses on the ability of the heart, lungs, and blood vessels to supply oxygen to the working muscles during prolonged physical activity. Exercises that fall under this category include running, cycling, swimming, and any activity that raises the heart rate and improves the efficiency of the cardiovascular system.

In contrast, muscular strength refers to the maximum amount of force that a muscle or group of muscles can exert in a single effort. Flexibility involves the range of motion in joints and the ability of muscles to stretch. Body composition refers to the ratio of fat mass to lean mass in the body. While all these components contribute to overall fitness, only the cardiovascular component directly addresses endurance-related activities, making it the correct answer for this question.