These days, many teenagers are really unhealthy. They just like spending all day surfing the Internet, like Tiktok or Instagram, or playing online games… And of course, it causes many big problems. Spending too much time online is very harmful to humans. It can hurt our eyes, make people addicted, and distract them from daily tasks like doing homework or exercising. As a result, students may become less focused, and people may not stay fit and strong. To reduce this problem, schools need to teach students about how harmful addicted to Internet is and organize more club or sport club, encourage students to enjoy so they can stay away from the Internet.