You do not need any materials, yet you may want to have a pencil and paper handy in case you want to take notes.  Optionally, plan to have some room around your area if you would like to do a flexibility activity toward the end of class.  No exercise is required.

学習者は、Outschoolが提供する基本ツール以外のアプリやウェブサイトを使用する必要はありません。

While I would not consider these two things mature content, I am sharing them here in case anybody is sensitive to these topics.  

I will share about how water helps us go to the bathroom and how lack of water can make it difficult to go to the bathroom.  I will talk a little bit about calories and about how people who drink more soda and less water are more likely to gain weight and why this happens.