What distinguishes the exercise principle of progression from that of overload? A. Progression requires that workouts get progressively more difficult, while overload does not. B. Progression deals with increasing fitness goals rather than the physical challenge of a workout. C. Progression concerns the overall fitness goals, while overload deals with the schedule of exercise activities. D. Progression and overload are actually the same fitness principle. Please select the best answer from the choices provided. A B C D