Was your mom able to go back to her pre-pregnancy size after she had kids?

So many of the people around my age that have babies seem to have completely and totally 100% bounced back to their pre-pregnancy size after kids (many with absolutely no diet or exercise involved). But after growing up with a mom who I'm pretty sure never ever went back to her pre-pregnancy weight, size, or shape, I always find it interesting to see people form my generation doing it seamlessly.