Marathon Reverse Splits

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29/12/2012 at 17:01

I read a lot of people talking about reverse splits in Marathons as the best strategy but less detail on how  extreme to make the difference between the two halves.  Let me give a (not so hypothetical) example.

I am running the Brighton Marathon in April 2013.  A time under 3 hours 15 mins gets me a good for age place in the 2014 London Marathon.  I have a 1:29 half marathon under my belt in the summer so 3 hours 4 minutes might be a reasonable target, which is scarily close to 3 hours. 

I would like to give myself a shot at under 3 hours but do not want to go off so quick and blow up in the second half - perhaps even ruining my good for age time for London.   So a reverse split would seem to be the way to go.  If I go for 1:32 in the first half does that give me too much to do in the second half?  Should I go even slower in the second half.?

I have a couple of 20 mile races to rehearse at but interested if there is any formula or advice on a reverse split.

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