I haven't exercised for a few years, young child, and have never been a runner. I've just completed week 2 and I'm feeling a bit nervous about moving on to week 3, some of the runs double in time. I think I can do it but I would have to slow my pace. I'm already running pretty slowly. So what I want to know is should I move to week 3 and just run more slowly or repeat week 2 till I can do it at a better pace?