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Hi, i'm a 50 year old who has been running pretty consistently but not competitively for the past 19 years and prior to that always raced cycles. This past year i've had problems with kidney stones and virus that wouldn't go away, but now i'm fit again and just starting my Rome marathon training schedule (today is day 1). I'm trying to set my maximum heart rate and although i know the process the results i get mean that even on my easy training runs what with being in hilly Sheffield, i'm in the red zone - according to the settings. So take this for example, my maximum heart rate is 173bpm based on 220 - 47bpm (resting heart rate as i wake up). I did a 4 mile easy early this morning and my heart rate hit 175, which means i was over my maximum. This was a hill but not eye-popping effort. It leaves me confused about my zones because looking at all of my runs over the past few years my average HR is 144 and my average maximum is 155. What i'm saying is that the MHR of 173 does not leave me much scope for making very much effort.