Aiki-jujutsu was once something that one was only allowed to train once one already had a jujutsu black belt. Jigoro Kano, the founder of judo (which is what BJJ comes from), regarded Aiki-jujutsu as superior to his own jujutsu, and sent his top students to be trained by Takeda Sokaku, Aiki-jujutsu's head. He was embarrassed when Takeda found his students lacking, and famously explained that judo was really just a "budo of sports." It's extremely difficult. Those who say it's not for practical s

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