Which of these is an example of a cardiorespiratory test?

A maximal stress test is a direct assessment of an individual's cardiorespiratory fitness. It typically involves exercising at increasing levels of intensity, often on a treadmill or a stationary bike, while monitoring physiological responses such as heart rate, oxygen consumption, and blood pressure. This type of test provides valuable information about the cardiovascular and respiratory systems' capabilities, making it a key indicator of overall fitness.

In contrast, the other tests mentioned focus on different aspects of fitness. The one-repetition maximum (1-RM) test assesses muscular strength by measuring the maximum weight an individual can lift for one repetition. The bench squat test evaluates lower body strength and endurance, while the sit-up test measures muscular endurance in the abdominal region. None of these tests specifically assess cardiorespiratory fitness, which is why the maximal stress test stands out as the correct choice.