假如你是李华，你收到一封来自外国朋友 Alan 的电子邮件，他与你分享了校园生活。请根据以下内容，给他回复一封邮件。
Dear Li Hua,
How’s it going? I’m always tired these days. Every day, I have P. E. class and do much exercise. You know I’m not good at exercising but I have to do it. What’s your opinion about it and why? I’m looking forward to your reply.
Yours,
Alan
注意：
1. 词数 80 左右(开头与结尾已给出，不计入总词数)；
2. 表达你的观点，给出至少两点理由并进行阐述；
3. 要求语句通顺，行文连贯；
4. 文章中不得出现真实的人名、校名和地名。
Dear Alan,
I’m glad to get your email and I really understand you.
Yours,
Li Hua

One possible version：
Dear Alan,
I’m glad to get your email and I really understand you. However, I think doing exercise is important for us. Here are my reasons.
First, exercise helps us strengthen our health. Though you feel tired now, regular exercise will make you stronger. For example, it can improve your sleep and give you more energy.
Second, exercise reduces stress. After studying for a long time, you can relax and clear your mind by playing sports. You might even find it fun once you get used to it!
Don’t worry if you’re not good at it now. Just try your best and do it step by step. You’ll see the difference soon!
Yours,
Li Hua