When your body burns calories more efficiently, you
a. exercise without fatigue.
b. decrease the amount of muscle mass and increase the amount of body fat.
c. increase the amount of muscle mass and decrease the amount of body fat.
d. lose all your body fat.?

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)

Ibelieve the answer is true, hope i !

Didn’t provide the information

Answer target heart rate;