That's one brave gal strapped into that human slingshot. This can't be safe. But then, if it were completely safe, it wouldn't be as much fun. Okay, it's unanimous: We all want to do this, today.
To paraphrase, nay, twist the words of Benjamin Franklin, those who sacrifice fun for safety deserve neither fun nor safety. But only to a certain point. That said, don't try this at home.
The Human Slingshot [The Uber Review]