Nowadays, many teenagers have health and lifestyle problems. They often spend too much time using smartphones, playing games, or studying, so they do not exercise regularly. As a result, many teenagers become overweight, tired, and stressed. Another problem is that there are not enough parks or sports centers for young people in some cities. To solve these problems, schools should organize more sports activities, and the city should build more playgrounds and gyms. Teenagers should also spend less time online and exercise more. I believe that with these solutions, teenagers will become healthier and more active.