Which of the following is true about fast-twitch muscle fibers? A.
They can deliver a lot of power for a long time.

B.
They contract very quickly.

C.
They are found only in elite athletes.

D.
They only twitch when you are nervous.

During the past few weeks or months, have you noticed any exercises that have become too easy for you? do you think you need to increase the intensity in any of the three exercise areas in your workouts? evaluate your exercise progress in the three exercise areas (cardiovascular, resistance, and flexibility) and list what modifications, if any, you may need to make in your exercise routine.