一种可能的解释是社会孤立——我们更喜欢在独自一人时做更多的事情，而比以前更少参加集体活动。
One possible explanation is social isolation-we tend to do more things on our own and engage in fewer group activities than we used to.
如果你不喜欢集体竞赛项目，没关系，另外找一个你感兴趣的体育活动。
If you don't like team sports, that's OK. Find another form of physical activity that gets you going.
如果你不喜欢集体竞赛项目，没关系，另外找一个你感兴趣的体育活动。
If you don't like team sports, that's OK. Find another form of physical activity that gets you going.
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