What principle of exercise refers to the difficulty level of a work-out?*1 pointRepFrequencyIntensitySet

Answer Analysis

The principle of exercise that refers to the difficulty level of a workout is Intensity.

1. Definition: Intensity in exercise science pertains to how hard your body is working during a workout. It can be measured in various ways such as heart rate, weight lifted, or the level of exertion felt.

2. Comparison with Other Options:

   • Frequency refers to how often you exercise, such as the number of workouts per week.
   • Set refers to the number of repetitions of an exercise performed consecutively.

Thus, among the options provided, Intensity is the correct answer as it directly addresses the challenge or load placed on the body during activities.

Final Answer

Intensity is the principle of exercise that refers to the difficulty level of a workout.