Marine Boot has an attrition rate of 9% for men and 18.1% for women.
The main factors are:
Pre existing medical conditions
Injuries occurring in Boot
Those account for 80% of the attrition rate.
Other factors are :
Recruits with children have a higher attrition rate
Recruits with GED's have a higher attrition rate
Very few recruits fail, because they cannot handle the physical part of Boot.
The two above fail mainly for mental reasons,
IE: they just decide they do not want to be there anymore.
The parents want to go back home to thier children.
The GED holders, never learned to finish anything
IE: a non polite way to put it, they are quitters who want the easy way.
Pre Training ?
Start running 3 miles is a good distance.
Push ups - try for 75 non stop
Sit ups - try for 75 non stop
Pull ups - try for 5 non stop.