> countermeasures such as butt-clenching

Ehm ...

I am actually not that convinced of that, largely because e. g. the KGB operated quite differently. And it seems very strange to me that the CIA would train an army of wanna-be's as ... butt-clenching recruits. The more sensible option is to have a poker face; and totally believe in any lie no matter how and what. That's kind of what Sergey Lavrov does. He babbles about how Ukraine invaded Russia. Kind of similar to a certain guy with a moustache claiming Poland invaded Germany (https://en.wikipedia.org/wiki/Gleiwitz_incident).

It's not butt clenching it's Kegels you just say butt clenching because it's funny.