“我认为这些迹象显然表明运动能带来幸福感，虽然任何运动都有好处，但多做一些可能更好，”她说。

But because most of the studies in this review were observational, she says, it is not possible yet to establish whether exercise directly causes changes in happiness or if the two just happen to occur together often. It could be that happy people are more likely to take up exercise and continue with it than people who feel sad. In that case, exercise would not have helped to make people happy; rather, their happiness would have helped to make them exercisers.

但她表示，因为这篇论文综述中的大部分研究都是观察性的，所以，还不能确定是锻炼直接导致快乐感的改变，还是两者碰巧经常同时发生。情况可能是，快乐的人比悲伤的人更可能进行锻炼并坚持下去。如果是这样的话，那么，不是锻炼帮助人们快乐，而是快乐帮助他们成了锻炼者。

Happiness also is an inherently subjective, squishy concept. The studies analyzed in the review asked people how happy they felt. But one person’s happiness could be another’s relative gloom, making it difficult to generalize about how any of us might react, emotionally, to starting an exercise routine.

快乐也是一种本质上主观、模糊的概念。论文综述中分析的研究询问人们感觉自己有多快乐。但是，一个人心目中的快乐对于另一个人来说可能是相对低落，所以我们很难推断出，每个人在开始进行常规锻炼时情绪上的反应是怎样的。

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