What is the portrait of Critical Thinking in the professional action of HPE Teachers? What are the meaning and usefulness of this form of thinking in a HPE setting? Based on Lipman's conception of Critical Thinking (Lipman, 1995, 2006), this study attempts to provide some understanding of the meaning and scope of Critical Thinking when expressed in the Teaching practice of HPE Teachers. To do this, nine HPE classes taught by three secondary school teachers were subject to observations and explanations via the stimulated recall technique. The results reveal that Critical Thinking in the teaching-learning process, although it has variable expressions among teachers, is essential to the relevance of Teachers' educational act. It promotes, in most cases, student learning and education.