假定你是李华，现在你学校很多学生因为种种原因很少参加体育锻炼。请你就此事为你校英语报写一封英语信倡导同学们积极参与体育锻炼。
内容包括：1）同学们不参加体育活动的原因；
2）进行体育活动的好处。
注意：1）词数100左右；
2）可以适当增加细节，以使行文连贯；
3）文章开头和结尾语已给出，不计入总词数。
Dear schoolmates,
Nowadays, most students don't do sports for kinds of reasons.
Yours sincerely,
Li Hua
One possible version：
Dear schoolmates,
Nowadays, most students don't do sports for kinds of reasons. They think that it is a waste of time and they amy get injured in the process.
In my opinion, it is very necessary f
