Meat Cleaver massages are now a thing. That's where you lie down and a masseuse whacks your back with two dull meat cleavers over and over. The massages have been popular in China for quite a while, but lately, they've been popping up all over the world. Check out this video from The Daily Mail.
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Is this something you would try? Even though the knifes have been made super blunt, I don't think I would participate in that kind of thing.