Group Fitness Instructor

Answer: C - Mitochondria help the muscle to produce ATP, therefore an increase in the size and number of mitochondria improve a muscle’s ability to use oxygen and produce ATP. With aerobic endurance training, the body has a greater energy requirement; therefore, an increase in mitochondria will help fulfill this requirement. Interestingly, it is not enough for individuals who wish to become runners (for example) to train aerobically; individuals looking to become better runners must run. The specificity of training doctrine tells us that it is not enough to generically train; the body creates in direct proportion to demand. “Specificity” trains the body by demanding exactly what will be required during the actual performance of any task.