<<- BrEaking of any kind.
If forced to watch breaking prefer suspended solely by a string... understand that as bone-fide skill. Or the object of choice in a stack of objects that too.... being skill, provided completely interchangable with any other identical object in the larger stack re: composition, treatment, etc.
<<- driving nails through boards with hand, foot, etc.
No clue why a hammer is not the APPROPRIATE tool do not understand the connection w/ martial skill myself. Bizarre feat, and unusual stunt...but why do I want to know this , spend time learning this... as a martial matter?