假如你叫李华，你校初三年级同学正在开展一场讨论，主题是初三学生要不要参加体育锻炼。请根据下面所提供的信息，用英语总结出讨论情况。
提示：
70%的学生
30%的学生
应该每天进行体育锻炼，但不要时间过长
锻炼浪费时间、使人疲劳
锻炼能增强体质，保持健康
锻炼以后很兴奋，较长时间不能投入学习
锻炼能使大脑休息，使学习效果更好
锻炼中可能会受伤
要求：语句通顺，句意连贯；词数为80词左右；发言稿的开头已写好，但不计入总词数。
Dear classmates:
Im Li Hua After the discussion we found that 70% of the students think they should take all kinds of exercise every day but not spend too much time. They think exercise builds body and can keep them healthy. Sports also let them have a good rest so that their study will be more effective.
On the other hand 30% students believe taking exercise is tiring and its a waste of time. They say that after having sports they are too excited for a long time to focus on their lessons. And its possible to be hurt while doing sports.