某英语网站进行了一次中学生健康情况调查,发现很多中学生的健康状况令人担忧,主要原因有:饮食结构不合理;体育锻炼不足;心里压力大;不能与人很好的沟通等等。为此,他们发起了题为“How to keep fit”的征文活动,倡导中学生的健康生活方式。请你写一篇80字左右的英语短文,说明如何保持身体健康。(文中不得出现作者本人的真实信息)
How to keep fit
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