Please can I have some advice/opinion:
RH was my first marathon and all was going well till 22 miles - 2 hrs 56 mins (i was hoping to break 3h 30m for the race itself). However, after mile 22 i got cramp in my quads only and had to fast walk/gentle jog, as advised by an excellent marshall, for the last 4.25 miles which took 44 mins. I came in in 3-39-57. I had taken on fluids at every point, felt fine for the whole race i.e the wall etc never arrived, but just cramped. My longest runs in training were 21 miles. Any advice or thoughts please ? ? ?