Which of the following is a common field test for measuring cardiovascular fitness?

The 1-mile walk is widely recognized as a straightforward and effective field test for measuring cardiovascular fitness. This test involves walking a measured distance of one mile as quickly as possible and assessing the time taken to complete the distance. The primary purpose of this test is to gauge the efficiency of the cardiovascular and respiratory systems during sustained physical activity. By timing the completion of the walk, practitioners can estimate an individual's aerobic capacity or VO2 max, which is a key indicator of cardiovascular health.

The other options, while important in their respective domains, do not specifically measure cardiovascular fitness. The push-up test primarily evaluates muscular strength and endurance, particularly of the upper body. Flexibility tests assess the range of motion in joints and muscles rather than the function of the cardiovascular system. Body mass index (BMI) is a measure of body weight relative to height, which serves as an indicator of potential health issues but does not directly reflect cardiovascular fitness levels. Thus, the 1-mile walk stands out as the most relevant choice for assessing cardiovascular fitness.