Ninpo-taijutsu, is more commonly known as ninjutsu, and both are relatively modern terms to explain ancient martial traditions and schools which were based in or around a lose counter culture to the more historically well known samurai, the traditional ruling class of Japan. The fact that the ninjutsu practitioners were usually based in smaller and more remote communities is one of the major reasons that their collective martial disciplines have been saved from fundamental change; what we have and what is taught is a system of martial arts that specialises in the total practicality of confrontation, aggression and combat. There is no sporting concept within the study of ninjutsu.
Ninjutsu is a very well reasoned set of congruent thoughts and actions specifically tailored and targeted at pitting your natural and learned advantages and strengths against the studied weaknesses of your enemy. This is strategy, this is the art of the advantage.