The difference between the number of times the heart beats per minute at rest and during maximal exercise.

When resting the heat beats 60-100 times per minute when you are older than 10 but during exercising you bpm increases because your body is trying to get the blood running to necessary areas and during exercise the body's muscles are increasing their activity level and consuming more oxygen.

it's false.

"every person has their limitations which prevent us from accomplishing something. some are better than mathematics for example and some are worse. those people who are worse might never be able to become mathematicians, but that does not mean that they would not be great at doing something else."