One of them is meditation. When I tried it a few years ago, it was clear my life improved in many different ways. Wanting to try it once more and to adopt it as part of my life, I was looking for a book as free of esoterism, cults, new-age fads and the like as possible. Although this is somewhat a new-age book, it fulfilled my basic expectations. It presents an (although not detailed, this is an introduction book) overview of various kinds of meditations (western, eastern, modern, traditional). It is a practice-oriented book, after each topic you'll find a simple or simplified exercise. Lots of quotations, not the usual "after the night the sun rises," but well chosen paragraphs that illustrate the topics being explained. No guru is in charge here, you don't have to follow rules and you are free to choose the meditation that best suits you. The language is plain and the layout makes it quite comfortable to read. I almost quit reading it when the author talked about the doubts that may arise about the practice of meditation in a very critical way, like we were supposed to believe (=have faith) in his words. He must have forgotten that later on, he quotes a great master saying that doubts are important and should not be disregarded in the learning process. Other than that, I feel safer now to choose what kind of meditation I want to study and practice, no longer lost in a jungle of buzzwords.