HRR = [(220 – 45) – 72] = 103bpm; THHR = 103 * 0.4 + 72 = 113.2 bpm and 103 * 0.59 + 72 ... Hard, 60% - 84%, 133 - 170, 70% - 89%, 137 - 174, 14 - 16.
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