Yeah but like what if you have to demonstrate without force what a defender is going to do to you in the 92nd minute in a corner kick line up? Like you have to prep people for the game they are playing.Rare for a coach to do that. Power structures etc.
I would tend not to believe it though. If you're a coach getting physical with a squad full of people half your age, you'll get battered. Better to prove your more intelligent, more driven, more powerful in other ways. That's pretty basic stuff.