Final answer:
Periodization is the progression from a lower intensity level to a higher intensity level, longer duration, and/or increased frequency of exercise in order to promote adaptation and prevent plateaus.
Step-by-step explanation:
The progression from a lower intensity level to a higher intensity level, longer duration, and/or increased frequency of exercise is known as periodization. Periodization involves systematically varying an exercise program over time to promote adaptation and prevent plateaus.