What does the cooper test measure? how far you can run in twelve minutes. how many times you can step up and down in a minute. how fast you can run two miles. how fast you can step up and down thirty times.

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)