Which of the following western states that have teams in the nfl.

Animals will lose energy because it is converted to heat

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 true atleast i think