Respuesta :
as a football player, I am pretty sure that an example of change in the intensity training principle would be C. level of effort you use.
Answer:
level of effort you use
Explanation:
Intensity in physical exercise is related to the power that your body is capable of withstanding the physical exercise in question. So intensity exercises usually test the power of your body through the effort you use to perform the exercise. Thus, we can state that the intensity is related to the capicity that your body has to perform an activity at a given time, so we can conclude that an example of change in the principle of intensity training is the level of effort you use .