Any form of wrestling is 'easy' and often unavoidable in encounter - with other hand, general clinch, balance etc. Most Renaissance sword manuals deal with some wrestling as well, for example.
Yeah, one of the others newbies and I were commenting on how kumdo is frustrating because you're not allowed to grapple with the other guy when your swords are locked, and it's kind of reflexive to try to trip him or punch him or go for his sword wrist or something.
Playing Pokémon X
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