there is one ultmate fighting stle ninjutsu it is nearly impossible to reach black belt, you have to dodge a sharp sword with eyes blind folded while your back is turn away from your teacher who is ready to strike you.

it is the dark and most dangerous martial art but has humble deciplen. every form of strike comes from every inch of the body, a boxer is a professional puncher but would be overwhelm by the speed balance and striking knowledge of a ninjutsu artist. even if any form of fighting ninjutsu would win it is the ultimate form, its the combination of everything all compact into one body power speed balance knowledge.

a ninjutsu master would overwhelm any form of other martial arts master. it is a tradition advance kung fu, kept in secretcy for decades of years. with every knowledge at any posible fighting scenerio, ninjutsu is no sport though it is the realest. if any one in the ufc or mma could master ninjutsu that man would be legendary and impossible to beat. but nope you won't hear anyone even with a little background of it.

I guess its because its bann to teach it. I'm a few lucky to learn a bit, sadly it was banned.