I know, I know... Think of it less as a stupid question and more a topic to stimulate debate
I'm taken up this year with a sprint triathlon, but always one to look ahead, I was thinking about a half marathon next year.
I can 10k no problem, and as that is about half way, I'm thinking that I could probably do it with what will be 12 months of preparation (Leicester half/marathon is around October each year).
But I'm interested to know what the main differences are for the step from 10k to just over 20k. Is it just more running, or are there some different types of challenges?