What to do if you like someone don't know how to tell them

It depends on how long you know them, maybe try giving them hints that you like them and see how it goes

Is that a negative 22 or a positive?

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)