[Kamog]

Another thing is, you should exercise at least three times a week.

When I was in high school, I didn't exercise. I took gym class until Grade 10 because it was mandatory, and that was the only exercise I got. After Grade 10, I participated in no physical activities at all. I just sat in front of the computer or read all day. Many years later, I was completely out of shape. It wasn't until partway through university that I started exercising. It's difficult to develop strength or flexibility when you're older if you didn't do anything when you were younger.