After the relatively pain free run around the block on Monday I doubled it up last night to do a whole 2 laps (according to the highly useful Magic Maps 2.4km). My main concern is I'm not pushing myself hard enough time wise (not actually owning a watch anymore) but at the moment its all about raising endurance. Once I get up to around 6-7km I'll consider running the canal tow path home but last weeks experience of hacking my lungs up has convinced me any running in the city center itself scores negative health points.
Of course none of this distance is even remotely close to what my folks run on a Sunday morning! Still we all have to live in the shadow of our parents ;-)