The theme of the text is the mediating practice of the teacher trainer on the Physical Education Degree course. I am interested in this research because I believe that being a teacher goes beyond being a simple transmitter of knowledge. It's not enough to know the subject, be proficient in technology or be a 'popular' teacher among students. Nor is it explicit in self-help or pedagogy books the most appropriate way to perform well in a class. The university plays a very important role in professional training, as it is here that the future teacher acquires the competences that will be...