The human brain is like one of our muscles, and like any of them, you must work constantly to not atrophy. We are used to seeing physically wellbeing more important than our own thinking, and because of that, we hardly work on our intelligence.

The purpose of this book is to work that powerful "muscle". We will begin with problems that activate our brain, just like what makes a warm-up to the muscles. Then, as the reader moves forward, we will develop other important aspects, such as the use of appropriate language for problem solving, ordered reasoning, and mathematical logical thinking.

Now, for this treatment to our brain to be effective, it is necessary for the reader to continue his exercise routine, once he starts, does not stop, in the end he will be able to realize that he has done a good to his mind.