i love using my runners on anything that requires distance, building especially.

i think tho, that my favorite time to watch runners is when I have then on farming, and they are running back and forth fishing. i time them, sorta, by watching who they come out of the water with, and then how close that villager is to the bin when the villager passes him the second time. its especially funny when they are fishing with a group of elderly villagers who are just doddering along slowly and then this young buck just swishes by them. i imagine all sorts of conversations those older villagers are having about the runner!