Let's take a quick look at what the Bible has to say, not so much about breathwork, in general, but rather what does it say about the breath and its relationship to the spirit. With this in mind, we can determine that God in his genius, the brilliant mind has left clues for us within the Bible to gain revelations that will help our spiritual walk with Him.
Let's take a look at this. The below information comes from a fantastic Hebrew study website www.hebrew-streams.org
In the Hebrew Bible, the word ruach occurs nearly 400 times. Its base meaning is "moving air" — whether in the form of breath, a breeze, or violent storm winds. Ruach is pronounced roo-ach (-ach like the ending of Pesach or Bach). In about 100 places in modern English Bibles, the word is rendered "wind." Notice Yeshua's play on the word pneuma (Greek, wind/spirit) in John 3 and the parallel in John 20: That which is begotten of the flesh is flesh, and that which is begotten of pneuma is pneuma.... The pneuma blows where it wishes and you hear the sound of it, but do not know where it comes from and where it is going. So is everyone who is begotten of the pneuma (Jn 3:6,8). When he had said this, he breathed on them and said to them, "Receive Holy Pneuma." (Jn 20:22)
We can see from this brief study that God was very careful with the words he placed in the Bible. So when we see a word that is interconnected like Ruach, let's take a careful look at what can be revealed from it. Unfortunately, the Eastern arts took hold of it thousands of years ago and no Christians have dared cross into its path to see what is within the practice in its purest form. We take away all the teachings including the self-empowerment and self-salvation beliefs. We turn around and give it back to not a source, but rather to Almighty God. He is our creator and we can do deep within ourselves to abide in his power and glory through powerful breathwork. I've been their first hand and it's amazing.
In my years of breathwork practice, I can tell you that it has turbocharged my spiritual life and my deep relationship with the Holy Spirit. Because Satan stole away a powerful practice and layered it with mystical Chakras, Kundalini snakes and other forms of demonic entities, why would it put such an effort in this form o practice? What if you knew that it was so powerful that he needed to guard it with all forms of pagan rituals and self-administered powers. Think about it. What is he covering up?