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Grappling is very important to know when you fight, because a fighter who does not know groundfighting can not stand up in every aspect of fighting. Sensei Titus Jansen a Koga Ryu Ninjutsu master is explaining groundfighting basics to his students. He ad some Koga Ryu Ninjutsu and Judo principles on to the jiu jitsu grappling what ofcourse makes it stronger. Sensei Titus Jansen is dthe founder of the Kage Ryu Dojo in the Netherlands.