Reggie and three of his friends decide to play a game of doubles tennis. Which of the basic rules in the game are modified because of the additional players? Height of the net
Number of strokes per volley
Scoring Size of the court

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)

Amos cookies- i have no idea