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by cuddlyogre 774 days ago
When I was in martial arts, breaking landscaping blocks with a palm strike was not difficult at all, but did sting like a hard high five. The trick is a stiff hand, but not so stiff as to be inflexible, and hitting mostly with the meat of your hand.

A regular punch or knife hand is much more prone to injury because of the more fragile bits being closer to the action.