Explain the difference between isometric and isotonic movements. Provide examples of each type of movement. Which type of movement would build muscle, and which would only improve muscle tone?

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)

Which of the following is a nonspecific defense against pathogens? - b cells - antibodies - t-cells - inflammation

Is it rare to have scoliosis and double jointed shoulders?