Please help! DUE IN 2 HOURS I cannot find out these words it's also about stress if that should help!

I need more information

Include the pictures

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)