That pic. Ew! (darcane: thanks for the laugh!)
I have a somewhat established, 3-season, sort-of-habit, daily morning "run". Run may not be the right word for it... more like "somewhat-faster-than-a-fast-walk". And not very far either -- maybe 2 km to a nice park where I sit & contemplate the river for a while, and then I walk back home.
But seriously, I find my "running" endurance is more mental than physical. Have never tested real limits though.