What do most people enjoy about physical fitness

You have weighed the likely outcomes of your decision to move in with your dad and have made a decision based on those outcomes what is an example of

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 dancer so i get cardio a lot)

What parts of the cardiovascular system are affected with atrial fibrillation?