Is this a choice? When a woman with 10 children looks fit like a 20 year old fitness model?

I know women who become obese after one pregnancy and I see people on t. v. who are very very skinny after 10 children. Is there a way to control your weight like the woman with 10 kids?

Is this a choice? When a woman with 10 children looks fit like a 20 year old fitness model?
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