Reverse abdominal breath.
Dragon, Triple Burner, Hora, micro-cosmic breathing, of various names are essentially the same technique with different names.
If anyone is to practice magic of any kind, this absolutely for your health, your sanity, control of magic and body along with spiritual awareness.

We start with a Mulabandha lock, this is where you clinch your Perineum and tilt your pelvis up this breath starts with your lower abdomen out and your upper abdomen in.
You start your in breath by tucking and your lower abdomen and imagine the energy going up the outside of your spine up your back filling in your upper abdomen and then your lungs to which point the energy reaches to the top of your head. You tilt your head slightly back. Then you reverse the process exhaling with your lungs first bringing the energy down through the front of your face, slowly, and as you empty your upper abdomen. The energy is going down through the front of your body back down to your perineum. And then you stick out your lower abdomen, bringing the energy up into your Dan Tien. The Dan tien is a space and an inch or two below the navel centered in your lower abdominal cavity. This is where you store your yin energy. As you practice this breathing energy will be coming in through your hands and feet and head and migrating to these central vessels. These central vessels are called the governing Meridian and the conception Meridian. As you cycled this energy it becomes homogenized it gets attuned to your body. This process is is repeated until the area gets warm, or until you are fatigued from the breathing exercise. This breathing exercise exercises, the organs. It squeezes the toxins and sometimes it is difficult to get a full breath. What is important is the focus of the energy during what is called the microcosmic cycle up the middle of the back, up to the top of the head down through one's front of their face and down the front of their thorax and abdomen. At the last of the outbreath stick the lower abdomen out.
Store the energy by exchanging your lower abdomen with you’re the middle of the stomach. Tuck in the lower abdomen and extend your middle abdomen out moving the energy up to and behind just below your navel. You are sucking the energy up into your lower abdomen, the Dan Tian.

Sometimes when the energy comes down through one's face, you feel it's split up and go around one's lips. Sometimes you feel the energy going through your nasal cavity to your soft palate and through your tongue. Through these exercises it is important to keep your tongue to the roof of your mouth.

You can augment this exercise by pausing the inhalations and exhalations at each surface chakra point. When halted to circulate the energy at that point, 3, 7 or nine times left then right. And proceed to the next point. Of course this depends on your skill at meditation and self control of your breathing. This is for advanced practitioners. This process does two things. First this would collect astral energy. Second, it helps it to adjust and harmonize this energy to yourself and to your body. Why this is important is because the yin energy for you to be healthy, must be attuned to you. How many energy workers from magical practitioners have you noticed that has suffered some sort of major medical malady? The conditions seems to be chronic persistent, and ultimately draining of the life force. This is because in many magical practitioners follow wrote and revealed procedures and processes as they were taught. One ends up using their energy and has not learned how to cultivate it or maintain it. Nor are they able to understand their bodies, spiritual and internal spiritual processes. The absolute importance of meditating to the point of where you have a calm mind is crucial. This is so that your energy is not attached to frustrations or connections with things external to you that cause you grief, problems or any negativity. If you cycle your energy, and homogenize your energy with this negativity, you are binding it to yourself. This is not what you want to do. This is why it is so crucial to meditate properly before the sessions.

So where does this energy come from? We come in contact with it all the time we have a natural flux of energy going in and going out. Do what you can studying the various traditions and learn about how this energy flows in through the day and cycles through the day. What is important is learning to have conscious control over this.
This is why people go to mountains or other sources of nature to have access to clean and natural energy not cluttered or polluted from people.

There are several other techniques for energy breathing. These are called Bell breathing, and five point breathing.

There are two types of Bell breathing the first is Tibetan Bell Breathing . Tibetan bell breathing starts with breathing out reaching with your senses attaching to energy. And as you breathe in collect that energy to yourself.

Daoist Bell breathing starts breathing in, yet reaching out and connecting with energy. Then as you breathe out, you focus that energy inward. There's two places to focus this energy. The first place is you Dan Tien. The second place as the energy is coming into your body. You push it into your bones and into your skin and into your organs.

The important thing about this type of energy collection is to be aware of the energy that you are bringing in. It is very important to be aware of the environment and energy as it relates to your physical body and be sure that the energy goes into the organs that it is harmonious with it. So this takes some traditional studying.

The five points breathing technique. You learn to breathe in through your hands and feet in the top of your head. This where it is also useful to know the acupuncture meridians, the energy type and the organs to which these meridians are connected to from your feet, hands and head. Ideally, you breathe in your hands feet and head and out your hands feet and head. This technique requires to the think of your whole body as a means for breathing energy. For example, when you breathe with your arms, gently reach out and grab the energy. And as you pull your hands in feel the energy coming in the same thing with your feet as you lower your pelvis and bend your knees, as you rise feel the energy coming in as you breathe in. And when you breathe out as you settle in a horse stance.
This is a useful technique also to all allow negativity to drain out as if you are your breathing it out. You can let go of negativity and have it seep out the palm of your hands and the bottom of your feet. They're several authors that a good magician should become acquainted with the first is Mantak Chia and the second is Jwing-Ming Yang. The first understands and teaches iron shirt Kung Fu and internal alchemy using the microcosmic breath. Mantak Chia also teaches stretches, and other internal breathing techniques to clear strengthen and inform the body of all the energy paths. Dr. Yang has probably the best by far books on Qi Gong. He also teaches Yang style tai chi. This ties in Daoist breathing, along with martial arts of tai chi.