Target zones for cardiorespiratory endurance are most accurate if they are based on a percentage of

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Target zones for cardiorespiratory endurance are most accurate if they are based on heart rate reserve (HRR), which is the difference between maximal heart rate (MHR) and resting heart rate (RHR). This takes into account an individual's specific fitness level and reflects the intensity of exercise that will produce aerobic benefits. Using percent of MHR alone can lead to inaccurate target zones for individuals with very different fitness levels.

Target Zones for Cardiorespiratory Endurance Are Most Accurate If They