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I was wondering... how much do the hills really slow you down? I did the Watford half marathon yesterday and it was very hilly. I still managed a pb which I'm very chuffed with but keep on wondering if I could do better on a flatter course. In a way what goes up must come down so I guess you make up the speed on the downhill so if it's a lap course it shouldn't matter too much? Or does it as a rule tire you out more when you go up and down?
I'm doing the Madrid marathon in April which is meant to be quite hilly and trying to figure out what I shoud be aiming for... Based on my 10k and half mara times I would say 3h50min but I've been told that because of the hills I should add at least 15min to my predicted time.
What are your experiences? Do you find that your times vary significantly depending on how flat/ hilly is the route?