There's a tribal group in the Amazon that does chest punching fights where two guys take turns punching each other in the heart trying to get the other guys heart to stop. It goes on until one guy gives up because lets' get real that shit's gotta hurt. But rarely someone dies from it.
A punch to the head can do it, especially if the subsequent fall is also rough
You can also give someone a sort of heart attack by hitting them in the chest. Look up "commotio cordis".
There's a tribal group in the Amazon that does chest punching fights where two guys take turns punching each other in the heart trying to get the other guys heart to stop. It goes on until one guy gives up because lets' get real that shit's gotta hurt. But rarely someone dies from it.