It means that your body is working hard to supply your body with oxygen, a sign that the exercise is very intense or that your body is having trouble coping (such as due to health conditions). The harder your heart is pumping and the harder your lungs are heaving, the closer you are to your maximum heart rate. Moreover, your active heart rate during exercise is an indication of how well your heart and lungs function to supply your body with oxygen. This is a direct indication of how hard your body is working and how much oxygen is passing through your system. The closer your heart gets to the maximum heart rate during exercise, the harder your body is working to sustain that level of activity. This is because if you know what your maximum heart rate is, when you go to measure your heart rate during exercise, you can gauge just how much any given workout is taxing your body. When exercising, something important to know is what your maximum heart rate is. This is a way of measuring how much your body is exerting itself when exercising. In other words, measuring your heart rate during exercise can tell you how intense your exercise is and how well your body is coping with that specific level of activity. It is important for athletes and regular exercisers to know what their maximum heart rate is, and what the heart rate is during exercise when compared to that maximum possible heart rate. When you are active, your heart rate is going to increase because when you are active, your muscles and organs require larger amounts of oxygen to continue functioning properly. When it comes to your active heart rate, things get a little more complicated. The lower your resting heart rate is, the more efficiently your heart and lungs are working to supply your body with the oxygen it requires to function. However, in athletes who engage in a lot of training, or in other words, people who are fit and very healthy, may have a resting heart rate as low as 40 beats per minute. When resting, your average heart rate, if you are healthy, should be between 60 and 100 beats per minute.

Your heart rate measures how many times per minute your heart contracts. Determining Your Maximum Heart Rate and Exercise Intensity Levels.

Exercise heart monitor