Warning, this book pushes everything you think you know about abs! at first the exercises may seem strange, even disconcerting: we feel the abs do not work, but in fact if .... Quad reads the book, rich in explanations, one quickly learns that "crunch" that is found in almost all programs are harmful to the spine! As bcp of his works here bare Christophe brings a comprehensive approach, which aims to strengthen balanced the center of our body (the "core"), developing not only the abdominal muscles, but also the antagonistic muscles (the paraspinal muscles among others). Nutritional advice are given by the author because many people think it is enough to make abs to have a flat stomach. Well no, it's a whole: apply the exercises of the book (depending on your position) and follow the nutritional advice of the book, and you will come to the famous chocolate bars dreamed as if such is your goal. Overall, this method is, I think, complementary to A body without pain the same author: various exercises of different levels, explanations, recommendations via its forums, videos on his youtube channel; you no longer have excuses not to get it!