Which of the following is the primary focus of the "storm-and-stress" view of adolescence?

The Storm-and-Stress View is Hall’s concept that adolescence is a turbulent time charged with conflict and mood swings. Adolescents’ thoughts, feelings, and actions oscillate between conceit and humility, good intentions and temptation, happiness and sadness.

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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)

Yes i have used it before