An individual might resist personal-development challenges •to avoid the anxiety of doing something new and challenging
•after reaching mid-life, when this need becomes less vital
•because they are only
important to pursue during
our senior years
•because they are known to diminish our ability to meet other needs

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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)