Success in individual sports requires that a person be proficient in all areas since there is no one else to to compensate for failures. true or false

True. An individual sport does not have teammates to assist you.

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)