Final answer:
Periodization is a strategy used in health and fitness to improve performance and prevent plateau. Undulating periodization is a type of periodization that involves changing variables such as volume, intensity, and exercise selection on a daily or weekly basis.
Step-by-step explanation:
The subject of this question is Periodization which is a pattern of physical exercise that involves some short periods of vigorous muscular work and longer periods of medium (and varied) muscular work.
Periodization can be used in health and fitness as a strategy to improve performance and prevent plateau by manipulating variables such as volume, intensity, and exercise selection.
One type of periodization is undulating periodization which uses changes in these variables on a daily or weekly basis to provide loading differences. This can include alternating between high and low intensity workouts or changing the exercises performed.