If your CV is really quite empty, you should also put in hobbies that either show that you are a team player, that show that you can be focused and dedicated, that show organizational skills, or anything else of importance.
Describe your (interesting) extracurricular activities in enough detail to be appealing. If you have 'reading, gaming, cycling' on your CV it sounds less impressive than 'studying C++ programming and gaming theory in my spare time and programming my own computer game; building my own carbon fibre bicycle'.
Note that if for example you build a bike with two other friends, mentioning this will show you have team work experience and that you are cooperative.
If you are applying for a specific position, nothing shows 'I am goal-oriented and pro-active' more than calling the person responsible and ask sensible questions about the position.