•What is heart rate: Heart rate is the rate at which the heart beats; usually measured to find a quick evaluation of a person's health.
•What is normal heart rate for a 13 year old: A normal heart of a teen is 60-90 beats pre mins at rest.
•When you exercise your heart rate: Your heart rate rises the max for teens is about 185 beats pre mins.
•What happens to your heart rate when you get older: Your heart gets slow because its a muscle which get more tired as you age.
•how to find your heart rate
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