Brah I lovee sled dogs they are so cute here is one of mine this is logan

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)

The correct answer is  "a) has ingredients that are high in nutrients."