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点击每期节目可以看到具体文稿内容An Hour of Running May Add 7 Hours to Your LifeBy Gretchen ReynoldsRunning may be the single most effective exercise to increase life expectancy, according to a new review and analysis of past research about exercise and premature death. The new study found that, compared to non-runners, runners tended to live about three additional years, even if they run slowly or sporadically and smoke, drink or are overweight. No other form of exercise that researchers looked at showed comparable impacts on life span.The findings come as a follow-up to a study done three years ago, in which a group of distinguished exercise scientists scrutinized data from a large trove of medical and fitness tests conducted at the Cooper Institute in Dallas. That analysis found that as little as five minutes of daily running was associated with prolonged life spans.After that study was released, the researchers were inundated with queries from fellow scientists and the general public, says Duck-chul Lee, a professor of kinesiology at Iowa State University and a co-author of the study. Some people asked if other activities, such as walking, were likely to be as beneficial as running for reducing mortality risks.High-mileage runners wondered if they could be doing too much, and if at some undefined number of miles or hours, running might become counterproductive and even contribute to premature mortality.And a few people questioned whether running really added materially to people’s life spans. Could it be, they asked rather peevishly, that in order to reduce your risk of dying by a year, you had to spend the equivalent of a year’s worth of time on the trails or track, producing no discernible net gain?968重庆之声每周一至周五8点56分每天三分钟养成良好英语听说习惯