Why does the human heart rate insincere when exercise?

Many dentist offices prefer i appreciate cherries because the use of these trays or what

The pituitary gland is controlled by sex hormones true or false.

Ihave a really high metabolism and only weigh 70 pounds (13 almost 14). people always ask me two questions: do you ever eat and how do you eat so much and stay so skinny. i am worried that a high metabolism wont me forever. what are some safe steps i can take to maintain being fit. (also, i already work out i am a dacer so i get cardio a lot)