Exercise is good for your health, but more intense workouts may not lead to better health effects. Two medical studies suggest that too much exercise is bad for heart health. The effect of exercise intensity on heart health shows a U-shaped curve German scientists followed 1,038 subjects with previous coronary heart disease and cardiovascular rehabilitation over a 10-year period. The researchers analyzed their exercise, frequency of cardiovascular episodes and deaths. The results showed that after correcting for other influences, the effect of exercise intensity on heart health showed a U-shaped curve: those who were the least physically active had the highest health risk (the risk of cardiovascular attacks could be more than twice as high as that of those who exercised moderately), and those who practiced high-intensity sports on a daily basis also had a higher risk of cardiovascular attacks and deaths, compared with those who exercised moderately. High-Intensity Exercise Increases Risk of Atrial Fibrillation Swedish researchers surveyed more than 44,000 men between the ages of 45 and 79, recorded their previous exercise, and followed their health for up to 12 years. The results found that the incidence of atrial fibrillation was elevated by 19 percent in those who exercised intensely for more than five hours per week, compared with subjects who exercised for less than one hour per week. This increased risk was more pronounced in people who performed high-intensity exercise at a young age and stopped exercising thereafter. How we should exercise 1, aerobic exercise one three five seven Aerobic exercise one three five seven, that is, moderate-intensity aerobic exercise at least once a day, continuous exercise for more than thirty minutes, at least five days a week to ensure that the exercise heart rate is about 170 minus the age of the recommended daily brisk walking 6,000 – 10,000 steps per minute to walk 100 steps, if the body can tolerate, but also can walk faster. 2, suitable for aerobic exercise Suitable for aerobic exercise including brisk walking, jogging, swimming, climbing, a variety of ball games. If there is no fixed time for exercise, then use the work gap or other fragments of time, try to stand, walk, reduce sedentary, the use of elevators and car instead of walking, so that the movement is always integrated into the work and life. Heart disease patients should pay attention to People suffering from hypertension, coronary heart disease, cardiac insufficiency, stroke, diabetes and other diseases, should be based on their own situation and doctor’s advice, to find the most suitable for their own way of exercise and exercise intensity, do not blindly follow. Patients with atrial fibrillation can also engage in physical activities, but should pay attention to changes in symptoms during exercise, such as palpitations, dizziness, chest pain, shortness of breath and other symptoms, you should immediately stop exercising, and if necessary, seek medical attention.