Anything you can involve a lap round the common in is a good one, particularly in summer. Hill Lane is decent to run up, good size pavements either side. From the station, up Hill Lane, right down Archers Road then left into Northlands Road all the way to the Avenue. You can either do a lap of the common itself (part Cowherds and the boating lake) which will bring you back out on Hill Lane or extend it and do The Avenue up to the roundabout, back down Burgess Road to Hill Lane and back down. I used to do similar with a gym running club fairly often.