Final answer:
VO2 max is the most common measure of aerobic fitness of the heart and lungs, as it is a direct measure of the maximum amount of oxygen utilized during intense exercise.
Step-by-step explanation:
The most common measure of overall aerobic fitness of the heart and lungs is VO2 max. Body mass index (BMI) is useful for determining relative body weight compared to height, but it does not measure cardiovascular fitness. Resting heart rate can give insights into heart health, but by itself, it does not provide a complete picture of aerobic fitness. Blood pressure indicates the force of blood on the walls of blood vessels, again important for health but not a direct measure of aerobic capacity. VO2 max, on the other hand, is a measure of the maximum amount of oxygen one can utilize during intense exercise, making it a direct and effective measure of cardiovascular and respiratory system fitness.