Which term refers to the surgical removal of a baby from the uterus?

You may be referring to a caesarean section, which is conducted when a natural birth through the vagina may be detrimental. 

Or a hysterectomy, which is a surgical procedure where a woman's uterus is removed. 

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)