Koreans are very dirty.
Agreed.
In my gym, the overweight trainers always find a way to interject some alleged injury they had, into the first 2 minutes of conversation with a prospective client. He used to be 220 with abs and could bench in the 400s, but then he hurt his back and had to take some time off, but will be regaining his previously held level shortly. The obese potential client completes the lie circle by spontaneously creating his own tales of past sports performance and stellar dimensions, coupled with an unprovable yet heroic injury (I hurt my "leg" rescuing someone from a fire).
Both impressed with their own storytelling ability and faith in achievable future grandeur, they'll high-five and begin some fruitless training together - for just enough time to keep the hapless trainer employed - and just enough training to leave the trainee sore and feeling deserved of an extra serving at dinner.