If you teach in Korea, you may have noticed that whenever you ask "How are you?" you get an automated response "I'm fine. Thank you. And you?"
I made a quick lesson that takes only about 15 minutes to help my students move beyond this.
What's up? (Nothing. Not much) How ya doin? (I'm OK. Not bad) How's it goin? How have you been? (Ok. Not bad).
I discouraged them against saying "so so" (Do any of you native speakers ever actually say "so so" to describe your mood? Personally, I'd say "The movie was so so" but never "I'm so so").
I used some Korean heart-throbs to catch their attention.