>>8993805Sorry, didn't see this. Singing like that can be difficult, but here's the way I do it without damaging my voice. Diagram attached for reference.
Whereas for normal (full voice, modal, whatever you want to call it) singing, it's your true vocal cords vibrating, for that kind of singing, you want to be pushing enough air that you're causing not just your true vocal cords to vibrate, but your false vocal folds to vibrate as well. When only your false vocal cords vibrate, that's called your "vocal fry" so you want to be able to combine that effect with your regular voice and air stream.
Basically, you want to be singing in your "normal" voice but with such a great quantity and speed of vocal breath support that you can cause the outer folds of your vocal cords to vibrate sympathetically. This shouldn't feel tiresome or difficult on your voice, but you may need to develop the control to direct your breath that specifically.
You could also try screaming with wild abandon, but that's a good way to hurt yourself, and I don't recommend that. Hope this helps! It's fun to experiment with your voice and discover all the many different sounds it can make.