Who wanna be friends .3. Like zooms cuz like im bored and have no life but be 11 or 12 or 10 idc as long you on of those ages -3-

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)