Angina and dyspnea (shortness of breath) are two critical signs and symptoms that indicate a person may be exercising at too high of an intensity level. Angina, or angina pectoris, refers to cardiac-related chest pain that can often radiate out into the left shoulder and down into the left arm. The pain of angina can radiate into the jaw, as well. Dyspnea refers to difficulty breathing. If either of these two signs and symptoms occurs, stop exercising immediately and immediately consult a health care provider.

Whatever method of monitoring exertion level during exercise is chosen, be comfortable with it before getting started with the activity. All of the methods are effective, but they do not work unless they are used correctly.