Which of the following descriptions matches the balance exercise principal? A. Targeted running should improve the performance of a certain task: running longer distances, lifting greater amounts of weight, and reaching higher levels of flexibility are all examples of how targeted exercise can improve performance. Repetition of specific exercises will help improve the given task.

B. A workout program must progress in its level of difficulty in order for the body to continue improving. If a workout never changes, the body will never reach a higher level of fitness.

C. In order for a fitness program to be fully effective, exercises that address all fitness components -- cardio insurance, resistance training, and flexibility -- must be incorporated on a regular basis. Focusing on just one of these components will hurt performance in other areas.

D. Exercise is most effective when a schedule is in place. Consistency helps you helps keep you motivated and your body in motion, so be sure to set and keep a regular schedule for working out.