What type of exercise is best for building cardiovascular endurance?

Building cardiovascular endurance primarily involves exercises that elevate the heart rate and improve the efficiency of the cardiovascular system. Aerobic activities, such as running and swimming, are designed to sustain prolonged physical activity, which directly contributes to this goal. These activities challenge the heart and lungs to deliver oxygen to the muscles over an extended period of time, enhancing overall fitness and endurance.

In contrast, weightlifting focuses more on building muscular strength through resistance training, which does not significantly improve cardiovascular endurance. While practices like yoga and Pilates can enhance flexibility and core strength, they do not provide the same aerobic challenge required for cardiovascular conditioning. Stretching routines also serve an important purpose in flexibility and injury prevention but do not engage the cardiovascular system in a manner that promotes endurance.

Therefore, engaging in regular aerobic activities is the most effective way to enhance cardiovascular endurance, making it the correct choice in this context.