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wow, you did you're longest runs on a hilly course? I don't know about you but when I do a 2.5 hour run on a hilly course I pay for it in muscle aches the next day. But if I do it on a flat course i feel like I worked my aerobic system harder and I am not limited as much by my muscles, and also the next day the run goes much smoother....Doesn't Lydiard say avoid hills?

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