have you tried the couch to 5km thingie (yeh I'm saying thingie coz brain isn't engaged to work out what I really mean), where over a period of time it takes you up to being able to run 5kms in 20mins (I think). I know some of the gang on here have done the challenge before.
I keep on meaning to start on it, but bewbies still a bit too big right now and I can't find a decent sports bra while I'm in between sizes.

