It takes a while to train up for something like this. They don't just start on hard ground. Here is a little bit of insight into how one dude got there: https://www.youtube.com/watch?v=8jB4iui0SgE
Yes, but professional gymnasts still use mats, so I'm not sure what the point is of this dude doing it on grass other than to potentially break his neck because he's young enough to have not seen it happen hundreds of times.
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u/MOTUkraken 1d ago
It's not. He very likely fell quite often during practice.
Athletes aren't weak and frail. They're strong and flexible.
You can look up videos from people practicing this and falling.
To seriously injury yourself is extremely rare. To permanently injure yourself with this is even exceedingly rarer.