I like how they all just took the name that old man made up (ring dinger). He should have trademarked it. There's like 20 people out here making money from videos using the name he made up. Why dokt they come up with their own name? Neck Wrecker Spine Splitter The Paralyzer
You could do this at home tho, lay on your back bring your legs all the way back over your chest and head, try to lift your back as much as you can and that’s stretching your hole back.
I had a similar method done and I was in such pain for A Long time. Couldn't turn my head either way. Never again. I stay clear of those bone Crackers.