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You'll have to give us more information PhilW5 - e.g. what long runs do you do? How do you carbo-load before your marathon? Do you take on sport drink during the race? What breakfast do you have?
and the classic
at what pace do you set off at the start of your marathons?
I trained up to 24 miles for London last year. I was less than a minute over the three and found i tired in the last 4 miles. I was using gels.
I like to have porridge the morning of a race and take a cerial bar/banana to eat just before the start.
I'm training for shakespear (25/4) and up to 22 mile at a slower pace than i would like. On my last long run I had a banana half way and water. I seem to be able to run 3 hour pace from the start but just can't hold that pace to the finish line.
Maybe I'm just not cut out for the longer distance?
You'll need to do the maths - how big is a serving for starters?