The thing I don't get is how do these parents have the energy for that? I quickly discovered with my son that if I set the bar much higher than "will he die or lose a limb from this?" then I would be exhausted and done for the day by 10 AM.

I love him very much, but I just wouldn't be physically able to prevent every accident. Is there some sort of exercise regime or diet or other lifestyle change that gives you energy for that?

(Not that I necessarily want to change that, I'm just very curious.)