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Calculate your upper and lower heart rate limit using this formula: Men: 220 – age = MHR Women: 230 – age = MHR Multiply your MHR by the percentages of the selected training zone. There are three training zones that are related to your MHR: • Health Maintenance Zone (70% – 60%) — The lowest training intensity. For beginners and those who want to strengthen their cardiovascular system. • Aerobic Exercise Zone (80% – 70%) — Increases strength and endurance. It works within the body’s oxygen intake