题目内容：

据世界卫生组织(World Health Organization)统计，全球81%的青少年缺乏锻炼。假如你是李华，请根据以下要点用英语准备一篇发言稿，在一次国际中学生交流活动中发言。

1.缺乏运动的原因;

2.运动的好处;

3.如何制定运动计划。

注意:1.词数100字左右;

2.可以适当增加细节，以使行文连贯;

3.开头和结尾已为你写好，不计入总词数。

Dear fellow students,

According to the World Health Organization, 81% teenagers are lack of exercising.

________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

That's all. Thank you!