Huh. That's weird because nowhere in Amanda's post does she say that doing a split makes her "healthy." All she says it that it shows she's flexible, which is just objectively true.
Your need to attack one specific individual is hardly something I'd call an "inspiring story," so I'm not sure why it's being published in a space that's supposed to be for "inspiring stories."
Perhaps you should look for one called "fat shaming, harmful troll who was once relevant in the field of fitness, maybe."
That would be a better fit.
PS. I wouldn't be worrying about Amanda's heart. I'd be worrying about your own. Carrying this much anger and hatred over total strangers really has to take a toll on one's health.