据美联社报道，美国国家科学院医学研究所5日发表报告说，一个人如果想保持健康，必须每天至少锻炼1个小时。锻炼不一定是剧烈的运动，可以是走路、轻松游泳、骑自行车或者打高尔夫等。 而在我国北方的冬季，天冷路又滑，许多运动已经不太适合从事了，所以许多老人走出家门后 According to the Associated Press, the National Institute of Medical Research published a report on the 5th that if a person wants to stay healthy, they must exercise at least 1 hour a day. Exercise is not necessarily a strenuous exercise. It can be walking, swimming easily, riding a bicycle or playing golf. In the northern part of our country in winter, the days of cold and slippery, many sports are not suitable for engaging in, so many elderly people out of their homes