Question

Determining your _______ is the best measure of cardiorespiratory fitness. A. number of breaths per minute B. pulse rate C. VO2max D. body mass index

Answer 1

The correct answer is letter C, Determining your VO2 Max is the best measure of cardiorespiratory fitness. VO2Max is the maximum volume of oxygen that a person can intake during bouts of exercise. There is actually a specific machine that measures the volume of oxygen intake a person can do during an activity. It is usually done in labs and in a controlled set-up. 

Answer 2

The Text book states it is Maximal Oxygen Uptake or VO2max

So your Answer is C

:)