We all have a unique body composition that we must take into account in terms of our fitness. Consider your own personal body composition. Evaluate aspects of your body composition and how they impact your weight, personal fitness plan, and fitness goals. Discuss how these aspects of your body composition make you feel.

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The answer id letter d 90 

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)

Probably the price and the type of car he is looking for