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I am really struggling to make the step up to full marathon distance. I've just done my second marathon, 7 years after my first. Both times were almost identical, around 4hrs 45. This is really disappointing as my half marathon time is around 1hr 45. In both marathons I got bad cramp (at 15 and 18 miles) and had to walk / run as best I could from then on. Anyone experienced the same and can give any advice? I am sure there's a sub 4 marathon in me somewhere! I know there's no magic answer, and training, nutrition and hydration are all key but any nuggets of info would be appreciated.