Yes I know it is tough. I live in the country and there is no green area. I have to drive my car to the end of the lane and park up as my lane is too scary to run up, there are no lights at all. But I just get out, for the first week all I did was walk quickly, Ruth talks about building up your strength over time. I never manage to run first thing in the morning either as I have to be up for work at 6.15, [although I fantasise about getting out one morning at 5.15 and then getting ready for work]
If you have to get up to your Mum at 3 in the morning it will be much easier if you are getting some exercise and generally feeling better about yourself.
I always go out in the evening before i go anywhere near the tv and tell myself well I could go out and feel better afterwards or I could slip into semi conscious state on the sofa watching telly so then I find the motivation to get out.
The point being that we can find away around these stumbling blocks, as hard as it is. Ruth's message is just get out there and walk for the first month and a half if you havn't done anything in a while and then work from there.
I think this book is fantastic and have recommended it to all my friends and family.
I would love my Mum who is not fit at all to join me on a run.