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Your exercise heart rate is the most precise way to measure intensity. Your target heart rate is a training zone—an estimate of where your heart rate should be to insure that you are training aerobically. Training below your target zone may not be intense enough to burn sufficient calories, while training above your zone will force your body to burn calories anaerobically (without or lacking oxygen) and inefficiently.
Another element in finding your training heart rate zone is determining the intensity level at which you should exercise. Your individual level of fitness will ultimately determine where you fall within this range. Use the following as a guide for determining your intensity level:
Beginner or low fitness level . . 50% – 60%
Average fitness level . . . . . . . . 60% – 70%
High fitness level . . . . . . . . . . . 75% – 85%
