With the improvement of the material living standard, the deterioration of the living environment and the attack of various diseases on the middle-aged and the elderly, people begin to have the pursuit of physical fitness. And running as a simple and easy way of exercise, no time and space restrictions, soon favored by everyone. But no one has ever thought seriously about what kind of running or how much intensity to exercise can be achieved to strengthen the body. Now with a foreign study to observe the results to reveal the answer. Danish researchers in the latest published in the “American Journal of Cardiology” in a study results found that fast running and other strenuous exercise over time may be harmful to health, and light jogging is the most conducive to longevity. This was the conclusion of a 12-year study. They found that people who jogged lightly for a total of one to four hours a week were the least likely to die suddenly. The researchers took 1,098 physically fit runners and 413 healthy habitual sedentary non-runners who participated in the Copenhagen City Heart Study, and by reviewing records of running time, frequency and personal speed found that the optimal frequency of running was no more than three times a week, and that the mortality rate of low-to-moderate runners was significantly lower than that of fast runners. Peter from Frederiksberg Hospital in Copenhagen. Dr. Schnorr explains, “Low-speed running is equivalent to strenuous exercise, and high-volume running is equivalent to very strenuous exercise. Running for decades over a long period of time has the potential to cause damage to the health of the cardiovascular system.” “If your goal is to reduce your risk of death and increase your life expectancy, then running a few times a week at low to moderate speeds is a good way to go. More exercise is not only unnecessary, it’s harmful.” So says Dr. Schnurr. Based on this study, we can likewise conclude that scientific exercise is more valuable than blind exercise, and as long as your running is not about going for records or winning awards, but rather about getting fit and preventing disease, you might as well choose a scientifically sound running program that works for you.