Brandon has not been an active teen, and he knows being physically active will help prevent problems as he grows older. Which health benefit can he expect when he is older? A) Reduced risk of heart disease B) Faster run times C) Increased frequency of runs D) Eliminating heart disease

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)

Little kids are eat dirt all the time so im sure you are fine