I use a technique no else uses, and at the start I was trying to emulate fighters being hit in the stomach. It had occured to me that fighters have generally more triangular upper bodies than other types of athletes. It turns out, that organs in the belly aggregate fat around them, and being hit in the stomach discombobulates the fat particles. I found a more intelligent way to emulate that, and less dangerous.
Altered state of consciousness start after 10-15 minutes of breathwork, when I put saliva on my scalp to clean the testosterone from the hair. That one was inspired by cats. The male scalp excretes lots of testosterone which cannot be removed with just shampoo. This also fixes androgenetic alopecia (it does not get reversed, but stops happening). I get seriously dizzy when I do that, that's why I have given up on all mind altering substances including alcohol. Getting dizzy from exercise is so much better.
There are 2-3 more exercises I do complementary to that. The breath work also is not breath work, it is something similar.