You can find the full web article, media and transcripts for the lesson here: https://adeptenglish.com/lessons/english-idioms-4/ -I think it’s true that positive rewards are a better motivation for most people, rather than negative ones. However, if you need someone to do something, and suitable rewards cannot encourage them to act, you sometimes need to highlight negative or even threatening outcomes. Especially if people will not do what you need them to do. Now that took quite a lot of English vocabulary to explain a simple scenario, a native English speaker would prefer to use an English idiom, a metaphor which explains the scenario in a much simpler idiomatic way.