The american equivalent of calvados is
a. ale.
b. cognac.
c. tequila.
d. applejack.

The American equivalent for calvados is D. AppleJack                                                                                                                                                                     

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 apple is red lol