Well, about 4 or 5 years ago I herniated a disk in my lower back. For the last two or three years it's been fine, with just some stiffness and slight pain first thing in the morning or if I'm inactive for a long while.
At the time I did it I was told not to run or do anything that could jar it. I've got to W7 of the programme and started off on a treadmill because it's softer to run on, but have recently started running outside. And this morning I woke up in reasonably bad pain. Oddly enough, I think the pain might be more to do with going swimming (outside, in cold water!) yesterday rather than the running, since I didn't run yesterday, but I'm a bit worried. I didn't run today but walked the route instead, since walking really does help.
I know, I should probably see my doctor for a definitive answer, but has anyone else here run with a dodgy disk, and did it help or make things worse?