Using that number: Z4: 90–95%of 185 BPM= 166 BPMto175 BPM Z3: 86–89% of 185 BPM = 159 to 165 BPM Z2: 75–85% of 185 BPM = 139 to 158 BPM Z1: 65–74% of 185 ...
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