Ninjutsu is the most feared forms of Martial Art because there is a lot of mystery attached to it. The disciples of this Japanese Martial art are known as Ninja and they learn the various techniques of survival, which is at the core of the Martial art. The Ninjutsu training is one of the toughest and revolves around mastering the techniques of disguise, concealment, sword fighting, explosives, medicine and gathering information. This is a Martial art of endurance and consists of 18 different skills from spiritual refinement to throwing stars (shuriken) and using the famous Samurai Katana sword. The greatest Ninja fighter is Dr. Masaaki Hatsumi also known as the Soke or Grandmaster.