What is the best way to help you ensure continued success in both fitness
and life?

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)

1. a lack of knowledge

Dis the answer i thinkhope this plz mark as beainlist