Which of the following is a benefit of high-intensity interval training (HIIT)?

High-intensity interval training (HIIT) is known for its ability to significantly enhance cardiovascular endurance. This training method involves alternating between short bursts of intense activity and periods of lower-intensity exercise or rest, which challenges the cardiovascular system and improves the efficiency of the heart and lungs. As participants repeatedly push to high effort levels during intervals, the heart rate spikes, providing a powerful stimulus for cardiovascular adaptation. Over time, this leads to improvements in aerobic capacity and endurance, allowing individuals to perform prolonged physical activities more effectively.

The other options present various workout advantages and effects that do not align with the recognized benefits of HIIT. Increased flexibility is typically associated with activities focused on stretching rather than the high-energy bursts of HIIT. Slower recovery times contradict the reality of HIIT, as the structured rest periods often help in managing recovery within the workout. A lower caloric burn also does not apply because HIIT is known for its high energy expenditure relative to time, often leading to a greater caloric burn during and after workouts compared to steady-state exercises. Therefore, the distinctive feature of enhanced cardiovascular endurance stands out as one of the primary benefits of engaging in HIIT.