An interesting book that takes 300 plus pages to describe what it probably could do in 20. The basic idea, you are happiest when you are involved or imersed in what you are doing. It then gives loads of examples of how this can happen in sports, music, work etc. Not the most practical book on the subject of happiness and it seems to neglect lots of things in pursuit of the Flow concept. For example it does not talk at all about the effect on happiness of advertising, too much choice, not living in the moment etc.