Maximum oxygen uptake is what the Cooper test measures
Psychological assessment is needed in certain cases where we're trying to determine certain psychological characteristics of the person we're assessing. This becomes increasingly important in cases where there is a HR department or something similar.
You’re body needs a variety of things , as well as you’re brain, to function properly. proteins,carbohydrates,minerals,amino acids etc . If you don’t consume enough of these it can negatively impact you’re health , both physical and mental.