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I believe the max. bpm heart rate is 220 minus age, for myself as 65 years of age this works out 155 max bpm. Recently I've reached 160/170 bpm while using a treadmill going by my personal HRM and the treadmill heart rate monitor, both gave almost the same reading. Is this safe and maybe normal ? I've always believed that when training for the threshold rate bpm should be approx 85%, approx 125/130 for myself. I have been running for over 30 years so don't think of myself as a beginner by an means.