Yeah, just emptied my system and then was fine about 20mins later and once I'd got some food down me. Same thing (but worse) happened to me last year after doing a road 20miler - my body just seems to struggle a bit with distances longer than about 19miles (done 18ish miles in training and did Yorkshireman half no problem). Guess I just need to do more long runs! At least I've got Edale Skyline before 3P to try a couple of things.
Mind you yesterday was the longest run I've done ever by about 2-3miles and half an hour.







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