The principles of fitness training that holds the body should be gradually required to do more than it is used to doing is

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)

Adislocation  occurs when articulating surfaces are forced out of position. 

Health education individuals understand ways to avoid diseases.