Which sports require aerobic endurance?

Swimming is the correct answer because it is primarily an aerobic activity that relies heavily on cardiovascular endurance. In swimming, athletes perform continuous movement over extended periods, which requires a well-developed aerobic system to supply oxygen to the muscles and maintain energy levels for the duration of the event. This is crucial for competitive distance swimmers, who often engage in longer performances that demand sustained aerobic capacity.

In contrast, tennis, while it does involve endurance, is more reliant on anaerobic energy systems for short bursts of high-intensity activity followed by brief recovery periods. Billiards involves minimal physical exertion and thus does not demand significant aerobic endurance. Boxing, while it requires stamina, combines both aerobic and anaerobic elements, often depending on the type of training or competition. Therefore, swimming is distinctly categorized as a sport that emphasizes aerobic endurance.