In need of advice please! I've just signed up for the Paris marathon, 20 weeks today. I have done a marathon before - in 2002, then took a decade off!! I've been working on my running and general fitness for the last six months, and can now run a 10k in 60 mins. So that's where I am now. Here are my questions: 1. I've chosen my plan, which is based on the Matt Roberts one, and includes 4 runs a week - one interval, one tempo-ish, one steady and one increasingly long. Would it be very detrimental if I did one run a week on the treadmill? Presumably the steady run would be best? 2. His programme is 16 weeks and I have 20. One of my friends said I should repeat a few of the early weeks to build a better base, but I think I should pocket them in case of illness / injury, and if I still have them left at the end chuck in a few more weeks of heavier mileage. She says this increases my risk of injury & fatigue. Who is right or is there a third (better) way? 3. I did my marathon a decade ago in 4.30. I ran 5 times a week but no intervals or strength. I'm starting from a similar fitness base and with a similar amount of time before the big day,but I'm 38 instead of 27 and running one less day a week although the runs will be better quality. Any chance I could do a similar time or is that unrealistic? Thanks!