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Can someone explain why Zone 2 training works like I am a toddler? Ive only ran once with my Garmin Golf watch which will tell me my heart beat and apparently I'm always running in zone 4 and even zone 5. My heartbeat is routinely 170 to 185 especially by the end of my run. I thought this was a good thing. But My friend who ran cross country and long distance track at our college said this is bad to do often and to run at zone 2 for a long time and for the great majority of your training. Apparently that is like fast walking speed for me. Even my "easy runs" are upper zone 3/lower zone 4.
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