Breathwork is a really uncomfortable experience. I lay on a floor mat hyperventilating for an hour with a group of people only to feel a little expanded. Breathwork was developed as an alternative to psychedelics becasue those were illegal, and now that psilocybin is readily available in California there's no need for it. Thumbs down.
It takes a while to get used to breathwork. When I started, focusing on the breath always gave me anxiety. It took quite a while to make it into a comfortable experience.