This isn't about being tough. I'm not the toughest kid on the block. I'm not the best fighter. I don't take the best punch. But I'm good, and unless you've trained, I'm probably better than you.
I know how to hit you very hard because I've been taught how to do this by people who know how. And unless you really know what you're doing, you won't be able to hit me back.
I'll take you to the floor and choke you blue, because I've been taught how to do this by people who've been to Brazil.
This is right on the money. A trained person has every advantage over a untrained STREET FIGHTER.