First, read the English article below.

There's a relatively simple formula to help you determine where your fat-burning zone falls.  It's not 100% accurate, but will give you a relatively reliable range to aim for.  First, find your maximum heart rate (MHR). To do this, subtract your age from 220 if you're male; subtract your age from 226 if you're female. Your fat-burning zone is between 60% and 70% of your MHR (Your MHR multiplied by .6 or .7).  For example, a 40 year old man's MHR would be 180, and his fat-burning zone would be between 108 and 126 beats per minute. There are a variety of heart rate monitors available— watches or wristbands, chest straps, and even built into handle bars of some cardio machines.  Heart rate monitors can help you accurately see where your heart rate is and based on your age, height, and weight can also determine your fat-burning zone.  By using a heart rate monitor, you're going to get a more accurate idea of where your fat-burning zone is. This is because the heart rate monitor will calculate your heart rate as you exercise and will then use your actual heart rate information to calculate your fat-burning zone. Many people that use a heart rate monitor for the first time realize that they may not have been working out as hard as they thought. Pay close attention and challenge yourself- safely. Although many cardio machines—like a treadmill or elliptical—offer a built-in heart rate monitor, they are not always 100% accurate. Heart rate monitors that use a chest strap are slightly more accurate than wristbands or watches.  They are generally also slightly more expensive. A VO2 max test (volume per time, oxygen, and maximum) test will accurately record your body's ability to transport and use oxygen during exercise. This test requires the participant to walk on a treadmill or use a bike and breathe into a face mask that measures oxygen and carbon dioxide levels as your heart rate increases.  This information can then be used to determine at what heart rate level you are burning the most fat and calories in your... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Tính toán vùng đốt mỡ của bạn theo công thức. Mua hoặc sử dụng máy đo nhịp tim. Kiểm tra lượng oxi tối đa. Sử dụng bài kiểm tra nói.