'The Core' is a combative fighting system that forms the foundation of all the disciplines contained within the ITSK World Bujutsu League. It is comprised of the central components from the various modes — ground, clinch, stand up, and weapons, and is taught through a set number of key drills and conceptual patterns. It provides the foundation for functional combatives at an accelerated learning rate.
'The Core' is incorporated into all of our open hand systems as the foundation to developing practical skills. It is also taught by some instructors as the primary mode of training, where students can then elect to go on and deepen their study of other disciplines. Its provides the necessary tools to increase the success rate in a fight so that the practitioner can— "recognise the fight, survive the fight, control the fight, end the fight, and avoid the fight".