Cardiorespiratory function refers to the ability of the human body to take in oxygen and convert it into energy. The whole process involves the heart’s ability to produce and pump blood, the lungs’ ability to take in oxygen and exchange gases, the efficiency of the circulatory system to carry oxygen to all parts of the body, and the muscles’ ability to use this oxygen. Good cardiopulmonary function also reflects the healthy functioning of all major body functions, which can infer a lower chance of chronic diseases such as cardiovascular diseases, endocrine system diseases, and respiratory system diseases. Modern people do exercise, in addition to fitness, more for fat loss and body slimming; in addition, should also exercise cardiorespiratory function as one of the purposes of exercise. How to exercise cardiorespiratory function to make yourself healthier and prevent various diseases? Exercise with oxygen can exercise cardiorespiratory function. In general, mild, up to the highest heart rate (i.e. 220 minus their age) 60% to 70% of the amount of exercise, the best fat elimination function, in the exercise of energy consumption of 40% from fat, 60% for carbohydrates. If you want to exercise cardiorespiratory function, you need to reach the highest heart rate of 70% or more vigorous exercise, and then 90% of the energy consumption for carbohydrates, 10% for fat. For example, too obese people need to exercise to eliminate fat, although strenuous exercise consumes a lot of calories, but it is not suitable to rush to carry out too strenuous exercise at the beginning, because their cardiorespiratory function still can not cope; or need to first use mild exercise to eliminate fat, and improve the basic cardiorespiratory function, gradually reduce weight and thin body, before enhancing the amount of exercise to exercise cardiorespiratory function, and further improve the effect of eliminating fat. The general public is not clear about their own cardiorespiratory function to what level, so it is necessary to carry out cardiorespiratory function tests to assess physical fitness and physical condition before starting to carry out suitable exercises to gradually exercise and improve cardiorespiratory function. Improving cardiorespiratory fitness: According to the American College of Sports Medicine (ACSM) recommendations, men over 45 and women over 55 need to have a physician on hand for maximum oxygen uptake testing, just in case. In addition to testing oxygen uptake through an instrument, it can also be assessed by a stair climbing test, running back and forth, or a specific distance such as a 2.5 km or 1 km run. As people are affected by changes in fat percentage and exercise, the general population’s cardiorespiratory fitness, all decline slightly with age, falling by 0.46 units per year for men and 0.54 units for women. Experts suggest that urban people exercise less, so they should do more moderate exercise to continuously improve the level of cardiorespiratory function to maintain physical and mental health. Heartbeat: As the heart muscle thickens and strength increases, each heartbeat becomes more efficient, resulting in a lower static heartbeat, increased ventricular volume, and increased total blood volume, which can return to a normal heartbeat even more after exercise. Blood pressure: Static blood pressure decreases or normalizes due to a more efficient heartbeat and the fact that exercise helps lower cholesterol and prevent blood pressure from rising due to blood vessel obstruction. Respiration: The depth of static breathing is enhanced and the number of pulmonary air bubble vessels is increased, resulting in a more effective exchange of gas and a lower breathing rate per breath. After exercise, it can quickly return to normal breathing rate, not to wheeze like a cow. Adherence to exercise is beneficial to the development of cardiopulmonary function adhere to long-term physical exercise people have a good body. A healthy body, a good physique completely rely on strong cardiorespiratory function to support. The human body through the lungs (respiratory organs) for gas exchange is called external respiration, however, the oxygen and nutrients are constantly transported to each of the body, the cells of this process is also known as respiration, so that it maintains the body’s metabolism. Therefore, the cardiorespiratory function is directly related to the strength of the body’s metabolic function and the speed of the body’s recovery function after fitness exercise. Fitness exercise makes a person’s heart beat faster, the heartbeat is strong, the cardiac output per minute increases, the microcirculation of the myocardium is fully expanded; exercise muscle activity generated by carbon dioxide stimulates the body’s respiratory center, so that the respiratory rate is accelerated, the lung capacity increased, and at the same time the respiratory muscles (diaphragm, intercostal muscles and intercostal muscles) and respiratory auxiliary muscles have been exercised, especially the diaphragm up and down the range of motion growth. Long-term exercise increases the weight and volume of the heart, slows the heart rate at rest, and thickens the ventricular wall of the heart muscle, making it stronger and more powerful with each contraction. People who exercise regularly may have a quiet heart rate of only 40-50 beats per minute, while the highest heart rate during strenuous exercise can reach 220 beats per minute. People who lack exercise will experience nausea, vomiting, dizziness, pallor, cold sweats and other symptoms of deficiency when their maximum heart rate exceeds 190 beats per minute in a stressful situation. Some literature reported that the oxygen uptake of girls 10 years after stopping physical exercise dropped by an average of 29%, but heart volume remained unchanged, indicating that exercise during adolescence still has a profound effect on cardiopulmonary function in adulthood, and has a very profound significance in promoting and enhancing physical fitness.