There are a few things to take into consideration when interpreting heart rate zones.
1) have you set your monitor up for you. I have a max heart rate of 188 so the general ones don’t fit me. I have to go in and change the zone rates for me to make sense for my activity. If you ever run over your max rate then you know it is not set up right for you.
2). How accurate is the heart rate monitor you are using. For general use it doesn't make much difference but when you want to start running in zones a monitor that is set up for fitness rather than weight loss will give more precise results but even they can be slightly out too.
If it is set up for you and for exercise it looks like you might have a bit of room to do some interval speed training, ie get short bursts that push you into the high intensity the
N a period of recovery, but that is very dependant on how the watch is set up. High interval training is best done calculated and carefully with good knowledge on how much you can push yourself.
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