Hello, well actually, from a psychological point of view, all theses “exercises” have to do with mind relaxation, when you do them, you feel more relaxed, which is good, would be like doing sports, running, etc etc. Even praying makes persons feel good, but its not because god comes and talk to them, but because some sincronization in the cerebral/brains waves, all of this caused by repeating the same things a lot of times, think in hipnosis, but in a “pre” level of it.
If nothing else you always have the power of the placebo effect, which is nothing to be sneezed at. That said, studies have shown the efficaciousness of acupuncture and other Eastern traditional practices, so there may be something to it.
If you start to hear voices or talk to the animals, though, I will disavow any and all knowledge of this answer.