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what is a good workout heart rate for my age, ideal heart rate for exercise by age, exercise heart rate for age, recommended heart rate for exercise by age, cardio workout heart rate by age, healthy exercise heart rate by age, working out heart rate by age, maximum workout heart rate by age, optimal exercise heart rate by age, heart rate during workout by age, max workout heart rate by age, exercise max heart rate for age, exercising heart rate by age, normal exercise heart rate by age