When adjusting the intensity level of your workout, it is important to

1. speed up your workout
2. take breaks when you are tired
3. always work through muscle fatigue
4. adjust it according to the type of exercise you are doing

4. adjust it according to the type of exercise you are doing.

Explanation:

The intensity of the exercise depends upon the type of exercise one performs daily. Some exercises require moderate intensity but others require high intensity and should be performed vigorously. For example, the cardiac exercises require a moderate level to a high level to check the activity of the cardiorespiratory system.  

Sometimes a combination of low, medium and high-intensity exercises is performed to stimulate different systems of the body and also done to avoid overtraining or overexercise.