Which of the following describes the cause of obesity as a lack of energy balance? a. more energy in than out=weight gain b. same amount of energy in and out=weight gain c. less energy in than out = weight gain d. more energy out than in = weight gain

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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)