And how would you know about Harry Houdini and what he could or could not demonstrate? were you there? do you have video?
the ability to withstand and recover is called internal strength.
if you get hit in the guts and immediately go loose in the bowels and weak in the knees, it's clear you lack internal strength.
If you think of it in terms of overall body development, core strength and ability to use dynamic tension, anywhere, on demand and couple that with increased durability, stamina and core strength, then maybe that's all you need is terminology that you can understand.
When people grind it all down to language issues of english versus translated english and cryptic transmission versus technical transmission in mother tongue, then it is obvious that stuff will get lost in translation.
To get angry about it is simply immaturity. seriously, making demands of people in regards to a subject you are uneducated on is the hallmark of churls. lol
try approaching with a modicum of decency and courtesy and maybe, just maybe someone might feel inclined to impart with something.
Ultimately, a surly attitude will get you nothing but rejected though. Just sayin...