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Thinking of doing this as a first 'proper' ultra (max I've done to date is 30m), but very worried about ability to complete it as I have a history of cramping on longer runs (marathons). Typically hits me about 1 race in 3, but there is no discernible pattern to it (ie not caused by running first half too quickly, hydration, nutrition etc - least, not that I have been able to establish anyway). Tends to be more likely to happen in hot weather (whoch perhaps points to hydration) but I've recently run a summer marathon and didn't suffer.........
I can shuffle through the last 5 or 6 miles of a marathon if it does happen (and have many times), but if it happens with 30 or 40 miles of an event left I'd be basically walking the remainder.
Any advice out there from anyone who has had similar experiences ?