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heart rate when working out by age
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heart rate when working out by age, working out heart rate by age, heart rate for exercise by age, heart rate workout by age, exercising heart rate by age, normal exercise heart rate by age, max heart rate when exercising by age, optimum heart rate by age during exercise, age and heart rate during exercise, recommended heart rate for exercise by age, healthy exercise heart rate by age, exercise heart rate by age and activity