Bianca, 22 years old, is slightly overweight and loves to eat, particularly junk food and high-calorie desserts. Fearful of gaining weight, Bianca often takes a laxative following an episode of binge eating. Bianca seems to be suffering from:

Eating disorder because I honestly don’t know

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)

The answer is chloroplast