Which of the following statements is true? a. alcoholics are able to stop drinking anytime they want. b. alcoholics will stop drinking if people tell them they have a problem. c. alcoholics can stop drinking if they can admit that there is a problem. d. alcoholics can stop drinking without from other people.

C. Alcoholic can stop drinking if they can admit they have a problem

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)