Why is it often easier to start a fitness program than it is to maintain one? A. The motivation at the start of a program is often higher than later on when the progress made might be less obvious. B. At the start of a fitness program, the body is less used to physical activity so it feels better. C. Maintaining a fitness program decreases an individual's ability to sleep, making it more difficult to maintain a program than to begin one. D. all of the above Please select the best answer from the choices provided.