"Hobbies"

1. What is a hobby?
2. What are the most popular hobbies among Estonian people?
3. Can you name any unusual hobbies? (extreme sports, collecting something unusual, etc)
4. Do you have a hobby? What is it? When did you start doing it? How often do you do it?
5. What else do you do in your free time?
6. Is it useful to have a hobby? Can it have some bad sides, too?
7. Should everyone have a hobby?