英语作文，要求是写一封建议信，建议如何学生如何锻炼身体，谁能看看我这篇文章哪里有语法问题，后天就要

Dear Sir and Madam,
I'm writing this letter to express some of my personnal perspectives on how to make students strong.Firstly,it"s essential to keep a balance diet to provide enough energy for a day's hard work of students.Secondiy,insist doing exercise like running is really important to have a healthy body.Last but not least,never stay up late so that you can keep a promise to getting up early to make a better preparation for a whole new day.
It'll really make me feel happy if you can take my advice.
Sincerely
Yours