Running backwards on a treadmill!!!? Reckon I'd be the only one looking like a muppet!!!
Thanks Becky Boo for the advice. However, although I subscribe to the magazine, and love it as it makes me want to get out there, I have to say I am at a total loss when I see the phrases 'tempo runs', '6x800m race pace', I just don't understand what it's about I'm afraid. 
I have been reading about increasing my fitness with bursts of 80-90% effort sprinting, and I understand that concept. I did try this a couple of weeks ago, and on my third 10 second sprint my hip went and I had to hobble back home! I haven't done it since. My training consists of steady jogging (today i did 3 miles) with a slight increase in pace when my fave song comes on (The Killers Mr Brightside!).
The incline tip is a good one, I'll do that.
Thanks JRM for advice too, you put my mind at rest re the treadmill!