Videos can be a good suplement if you train in a dojo with a qualified instructor, but don't go for this long distance Shodan crap.
Ninjitsu as it has been taught in the west in current days is also very controvertial. Do some research about the ninjas and their art. Historical reading and not the pop books at the martial arts section at Barnes and Nobles.
What is your interest in ninjitsu?
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