On this issue, I think there is some truth, which can be good for the health, but it is not as big as these people think. First of all, people who make a hullabaloo about in the park in the morning can breathe out the phlegm and waste gas in their lungs, enhance their vital capacity, absorb fresh air and exercise their chest and neck muscles. By shouting, they can cultivate and stimulate their self-confidence, which should be said to have a certain effect. Secondly, we should not exaggerate this exercise method. Similarly, running can enhance lung capacity, and we can play Tai Ji Chuan and so on, which will play more and greater roles. Thirdly, even if this exercise method has certain effect, it is inappropriate to pay attention to personal image and not to make too much noise, which will affect other people's activities and interfere with other people's exercise.