What weakness do you find in the definition of health given by WHO

Physical and mental condition of the body is called Health. It is very necessary to keep our health strong.

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)