I recently came across this great-sounding interval-training plan where you slowly build up to being able to run 5 km non-stop!!
I'm keen to start this soon - was wanting some BB buddies for support!
If you're keen, just google "couch to 5km" and you should be able to find it.
EG Week 1 Workout 1 - 5 min warm-up, then alternate 60 sec jog with 90 sec walk for 20 mins total.
It's a nine week, 3 x a week plan - but I think I'll be stretching it out if I'm not ready for each increase in jogging!!