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.
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.