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Even pacing. If I've got a definite time target I might start off a bit quick for the first mile or two, build up a very modest cushion in the first half, not more than half a minute or so, then aim for metronomic splits for as long as possible. Throw the kitchen sink at it in the last mile when you know the wheels aren't gonna fall off. (Hopefully.)
@CompoS - Nice one! Surely the stepping stone from a HM to Ironman is a marathon? ;-)
How would you guys pace a flat 10 miler (Derby 10 in November)?
I want to break 1hr 15 which is around 4.40/km (my 5k ~4.00, 10k~4.20, hm~5.00)
Do you run a bit under in the hope you build up a time cushion or stick to the pace and aim for a negative split?