So you’re between the (1) ………of thirteen and eighteen. What makes you happy? There have been (2)………. of surveys about teenagers and happiness and they all come to different conclusions. Some surveys (3)…………. that most young people are happiest when they (4) …………time with their family. (5)…………… say it's when they're with friends. Some teenagers think that getting good marks at school and passing exams makes them happy. The problem is that there isn't just one thing that makes everyone happy. Happiness is something different for each of us, and what made us happy last week might (6)…………… make us happy next week! However, there are some things that can help improve our mood (7) …………we're feeling unhappy. Experts believe that exercise can make you a happier person – but (8) ……….? Exercise releases chemicals in your brain that are related (9) …………..a feeling of pleasure. Many people who exercise say that the more exercise they do, the more they want to do. Now we know why! In (10) ………..to this, exercise is also good for our physical health.