heart rate, target zone

heart rate, target zone

A heart rate that is 50% to 80% of an individual's maximum heart rate. Persons who exercise to attain or maintain physical fitness should attempt to exercise vigorously enough to produce a heart rate that is both safe and effective. When an exercise program is begun, the heart rate should be at the lower end of the 50% to 80% range for the first few months. Then it should be gradually built up to 80%.