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You might find it superfluous or tiresome when friends share their times for their latest mile run on social media. 朋友们在社交网络上分享自己最近一次长跑的里程数，你可能觉得这种行为既肤浅又磨人。 But a new study finds that it will actually motivate you: Exercise, it turns out, can be contagious. 不过，新研究证实，他们的行为其实对你有激励作用哦：事实证明，运动是会传染的！ The study examined exercise habits of more than one million runners across a five-year period. 这项研究历时五年，对超过一百万名长跑者的锻炼习惯进行了调查。 | 
