What is a common function of carbohydrates, proteins, and fats in the body? provide energy
control chemical reactions
insulate nerve cells
prevent constipation

A common function of carbohydrates, proteins, and fats in the body is providing energy

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)