【素材】Unit-7-Lesson-38-文本-The-Way-to-Health(冀教).doc

阅读材料：The Way to Health

America is a country on the move. People of all ages are exercising their way to better health. According to the latest figures 59 percent of American adults exercise regularly up 12percent from just two years ago and more than double the figure of 25years ago. Even no exercisers believe they would be more attractive and confident if they were more active.
It is hard not to get the message. The virtues of physical fitness are shown on magazine covers, postage stamps, and television ads for everything from beauty soaps to travel books. Exercise as a part of daily life did not catch on until the late 1960s when research by military doctors began to show the health benefits of doing regular physical exercises. Growing publicity for races held in 　American cities helped fuel a strong interest in the ancient sport of running. Although running has leveled off in recent years as Americans have discovered equally rewarding and sometimes safer---forms of exercise, such as walking and swimming, running remains the most popular form of exercise.
As the popularity of exercise continues to mount, so dose scientific evidence of its health benefits. The key to fitness is exercising the major muscle groups vigorously enough to approximately double the heart rate and keep it doubled for 20to 30 minutes at a time. Doing such physical exercises three times or more a week will produce considerable improvements in physical health in about three months.
健康之路
美国是一个运动着的国家。各个年龄段的人都在以他们各自的方式在增进健康。根据最新数字，59%的美国成年人坚持每日锻炼。2年以前上升了12%，这比25年前的两倍还多。甚至不参加锻炼者也认为，如果他们积极参加活动的话，将会更受人欢迎也更自信。
获得这样的信息是容易的。体育锻炼的益处出现在杂志封面上，邮票上，以及从美容香皂到旅游指南的各种电子广告上。直到20世纪60年代，当军队医生研究表明坚持锻炼对健康的好处时，锻炼身体作为每日生活中的一部分才成为一种时髦，在美国一些城市举办的赛跑活动变得众所周知起来。这样一件事实有助于维护公众对传统运动项目如跑步等的强烈兴趣。虽然跑步这项运动近年来呈平稳发展态势。但仍然是美国人感到满意的一种运动形式，这种运动形式安全。诸如散步，游泳和跑步还是最流行的锻炼方式。
作为一种流行的锻炼方式持续升温，锻炼对于健康的益处已有科学证据。身体健康的关键在于用力锻炼主要的肌肉群，以使心率增加大致一倍并使这一心率每次持续二十至三十分钟，在三个月内从事这样的锻炼三次或一星期，将对身体健康产生可观的好处。

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