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If your friends are happy—turns out you're more likely to be happy too. If your friends are overweight, that too ups the odds you'll pack on pounds. 如果你的朋友很快乐，那你也快乐的可能性很大。如果你的朋友体重超重，那你体重增加的几率也会上升。 Those effects have been shown in studies. And now researchers have identified another seemingly contagious quality: exercise. 这些效应已经被研究证明。现在，研究人员证实了另一个似乎具传染性的东西：锻炼。 The investigators analyzed the running activity of more than a million individuals worldwide who used an exercise tracking device for five years. And they used weather patterns as a way to randomly examine different parts of that global network. 研究人员分析了全球100多万人的跑步活动，这些人5年来一直在使用运动追踪装置。研究人员运用天气模式对全球不同地区进行随机检测。 | 
