This book was written to assist students, new teachers, and coaches in Arnis in learning and teaching the skills of the national sport of the Philippine Islands in the most straightforward and most efficient manner possible. Arnis is a vital component of physical education, particularly for Filipinos. Learners at all levels of education, from primary to secondary, need this type of activity. Because it improves one’s fitness, acquires life skills such as confidence, social interaction, problem-solving, develop self-discipline, respect, perseverance, dedication, develop interest and enjoyment, and most of all, foster nationalism. Arnis is a national sport, and that learning is an effective way to foster patriotism not only among students but also among teachers. As per Republic Act 9850, an Act Declaring Arnis as the Philippine’s National Martial Art and Sport. The Act mandates the Department of Education to include Arnis in the Physical Education (PE) curriculum. Consequently, PE subjects are handled by teachers who do not specialize in PE, resulting in non-teaching of Arnis in the field. Another challenge encountered in teaching PE, especially the Arnis sport, is the limited number of references available in the field. This book contains the principles of Arnis in order to further the propagation of the Philippine National Sports. The activities and instructions in this book have been illustrated to make the information more intelligible and accessible to the reader, whether he or she is a student, practitioner, instructor, or coach.