You have received a letter from your English-speaking friend, Ann:

… My older brother has got a new hobby – he has become a mountain biker. I know that mountain biking is a dangerous kind of sport and I worry about him. I would like him to spend more time at home. I wish he had chosen a safer entertainment…

…What indoor sports are most popular with teenagers in your country? Why do teenagers often do extreme sports? What kind of sport is your favourite?

Write her a letter and answer her 3 questions. Write 100–120 words. Remember the rules of letter writing.