Suprisingly, even colleagues who supposedly do "run" only ever take part in large road events, and see running as some sort of cross to bare in order to raise money for charity rather than anything enjoyable. I'm not knocking them but to them, fell or xc running is some kind unfathomable, masochistic torture.
I have long since given up trying to explain any form of running (let alone fell) to any of the uninitiated.These days I largely prescribe to "If I have to explain, then you probably won't understand" school or thought........that way I don't get too many stupid comments back!