你可能对基因的组成部分不太了解，所以我简单介绍一下，染色体端粒是DNA链条末端的小帽子。随着细胞老化，它们会缩短、磨损，不过这一过程不完全由时间决定。肥胖、疾病和其他健康问题会加速端粒缩短，导致细胞提前老化，而有些证据表明健康的生活方式能维持端粒长度，延缓细胞衰老。

For the new experiment, the Swedish scientists recruited a group of sedentary, overweight men and women, all aged 68, and drew blood, in order to measure the length of telomeres in the volunteers’ white blood cells. Then half of the volunteers began an individualized, moderate exercise program, designed to improve their general health. They also were advised to sit less.

为了这个新实验，瑞典科学家招募了一群习惯久坐的68岁超重男女，采血测量他们白细胞中端粒的长度。然后，其中一半志愿者开始个性化的适度锻炼计划，旨在提高总体健康状况。同时建议他们少坐。

The other volunteers were told to continue with their normal lives, although the scientists urged them to try to lose weight and be healthy, without offering any specific methods.

科学家们让其他志愿者继续像往常那样生活，但是鼓励他们尽量减肥，保持健康，不过没有提供具体方法。

After six months, the volunteers all returned for a second blood draw and to complete questionnaires about their daily activities. These showed that those in the exercise group were, not surprisingly, exercising more than they had been previously. But they were also, for the most part, sitting substantially less than before.

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