Which muscle fibers are best suited for activities that involve lifting large heavy objects for a short period of time?

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)

You should expect adults to respect you in return. true false

Cardiac output is affected by heart rate exercise stroke volume all of the above