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I think if you want to run fast you need to avoid hills in racing, I doubt there are many people who go faster on a hilly course.
one thing to remember when adding in hills, occasionaly train going down as well, we used to use the downhill as recovery and noticed that in races where there was a hill we'd make up 10 places on the uphill and lose 8 on the down as mentally and technique wise the uphill was attack and the downhill recovery!!
great work, was that at a parkrun or a road/track 5k?