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I am running my first marathon on 3rd November. Training has gone well until my long runs (12 miles +).
I have tried all sorts of tactics but I hit the wall at 12 miles each time. I know that I carb load really well in the days before and I eat a decent high carb breakfast 2 hours before I run.
40 minutes in I start to refuel with a combination of Cliff Blocks and an energy bar as well as sipping powerade. In total I consume around 120g 's of carbs during the run.
Around 11 miles in I start to tighten in the legs and around 12 miles it is unbearable and I cannot continue running. I stretch really well before I run, and after, and I am only running twice a week now in order to give me as much rest as possible (as I initially thought it was because I was running too often).
I run a comfortable 10'30" per mile - in fact I find it really difficult to run any slower, so I don't think it is a speed issue. I trained for and ran a half marathon in April and felt great, I have never had this problem before.
Any ideas? One thing I haven't tried is starting to refuel earlier, rather than waiting until I am 40 minutes in, but I don't want to be constantly eating while I am running. I am feeling pretty desperate now and getting really worried about not enjoy this marathon.