Which is the correct formula to identify the maximum heart rate for a 12 year old?

just put in mind that others aren't perfect. we all have problems that we feel makes us low of the low. but know that you are special and unique, that is what makes you out of this world : ). you might think and feel that others judge you, but mostly other people are scared if people judge them. just be happy, spend time with family, smile because that is the greatest medicine. a happy life. hope this : ))

if u need the answers look it up on google youll find it trust im just saying this incase no one out : )