There is every reason to believe that a new "principal principle" of physical activity education is emerging. In this article, the author talks about the new "principal principle"(#14) of physical education. Revisiting a historical milestone in the field's history to explain the origin of the term "principal principle," Dr. Arthur H. Steinhaus, George Williams College, speaking to the former College Physical Education Association in 1951, identified what he termed as the four "principal principles" of physical education. Principles Nos. 1, 2, 8 & 9 (as one) & 10 were those offered originally by Dr. Arthur Steinhaus, George Williams College. This list of four "principal principles" was enlarged to thirteen (13) such "principles" based on Zeigler's analysis of evidence made available by research and scholarship carried out during the second half of the 20th century (Zeigler, 1994). This article presents the list of principal principles.