Extreme sports have traditionally been the only the maddest get to know most violent and dangerous, and naturally rebellious teenagers keen to worry their mothers. But as with any trend thinks anything of himself, the history and diversity of 'extreme' activities - also known as action, adventure or dangerous sports known - are much more interesting than many believe, and there are good organizations, established to help to Immerse yourself in its adrenaline-soaked world, almost as safe asother hobby.