Which of the following workouts is primarily focused on cardiovascular endurance?

The correct answer is running because it is an aerobic exercise that significantly elevates the heart rate and promotes cardiovascular endurance. This type of workout primarily engages large muscle groups in sustained activity, improving the efficiency of the cardiovascular system in delivering oxygen to muscles during prolonged physical exertion. Running challenges the heart and lungs to work more effectively, leading to adaptations such as increased stroke volume and improved VO2 max—key indicators of cardiovascular fitness.

In contrast, weightlifting primarily focuses on building muscular strength and size, not aerobic capacity. While it can improve some aspects of fitness, it does not significantly enhance cardiovascular endurance in the same way that running does. Similarly, yoga and Pilates emphasize flexibility, core strength, and body awareness rather than sustained cardiovascular effort. These activities can contribute to overall fitness, but they do not primarily target cardiovascular endurance as running does.