Biofeedback and yoga practices work together, since yoga practices teach you to breathe normally and to meditate. Through meditation, you can learn to develop abilities to look within yourself to see physiological, mental, and emotional responses that may link to problems. Once you reach within you want to study self-using biofeedback techniques to find causes that make you feel stress.
How yoga uses biofeedback to help you:
Yoga teaches deep normal breathing. In order for you to take in deep breathe, you would have to sit straight and or stand up straight and meditate.
You would want to clear out throat and meditate on what you are about to be doing at the start. You should always be sitting straight in a vertical fashion. You should always have hands and mouth closed. Avoid tension, yet realize that at the beginning you may feel tense, thus let it slide since gradually you will begin meditation.