1. the key to the success of following any diet plan is to
tams
o a. limit all forms of sugar in the diet.
o b. follow only the dash diet.
o c. keep the diet healthy and balanced.
o d. restrict as many calories as possible.

C keep the diet health and balanced

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)