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5:30min/km is quite fast after a longer break imho. What's your normal pace? I'm currently forcing myself to run slower to keep me heart rate low. I've read that this will lead to a better basic endurance. Quite boooring, but also relaxing.
I have always found running slower too much of a mental challenge, though. The effort of getting outside and running was always enough of a barrier that whenever I achieve it, I want to push as hard as possible. Having said that, I never tried very hard... ;)
