All of the following are FDA approved health claims, except for . low-fat diets may reduce the risk for some types of cancer
diets high in saturated fat and cholesterol increase risk for heart disease
low-sodium diets may help lower blood pressure
vitamin D may reduce the risk of depression

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)