Stage 1 of delivery averages about 8 hours but may be longer for first-time mothers.

Hope this is a true or false question, if so the answer would be True.

They need to know because sometimes they have a symptom

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)