Which is not a risk factor for having a baby with low birthweight? smoking during pregnancy exercising during pregnancy teenage pregnancy dieting during pregnancy

Exercising during pregnancy

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)