Target heart rate zone, Monitoring your heart rate – Keys Fitness Health Trainer CLASSIC HT-CLASSIC User Manual

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Target heart rate zone, Monitoring your heart rate | Keys Fitness Health Trainer CLASSIC HT-CLASSIC User Manual | Page 17 / 29 Target heart rate zone, Monitoring your heart rate | Keys Fitness Health Trainer CLASSIC HT-CLASSIC User Manual | Page 17 / 29
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