Mini Stick: The effektive self-defence weapon on a key chain by Sander, Cord

He started practicing judo as a child at the age of 6. In 2002, in the course of a study trip, he found his way to Japan. In 1997 he founded KOHAI - DO e.V. together with Markus Wandscher. He has already published various books on self-defense and the martial arts.

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