Before you read further, I'd like to mention that the word "supernatural" may to some people seem to refer to something that goes against nature. Nothing could be further from truth. All abilities are developed in accord with natural laws. However, the natural laws do go beyond the world of Newtonian physics and move into the realm of quantum physics. These natural laws are laws of mind and spirit and these can and do over-ride the known laws of physics - as they relate to the physical dimension of experience.
There are two ways of living in this world - at-one with the Infinite or separate from the Infinite. When you experience yourself at-one with the Infinite, it is said that you are God-Realized being; when you experience yourself separate from the infinite, it is said that you are still in mortal consciousness.
The entire difference is in what do you choose to identify yourself with. If you identify yourself with your physical body, you are in mortal consciousness and as long as you are in mortal consciousness, whatever you can accomplish will be in some way limited. Since the vast majority of people on this planet are in "mortal consciousness", they consider as "natural" only that which their mortal (physical) senses can behold.
If you identify yourself with Infinite Spirit, then you are in spiritual consciousness, merged with the Ocean of Infinite Love, Power and Wisdom, with the infinite ocean of energy. When you are in that state of consciousness, supernatural abilities appear spontaneously and without asking for them. They are merely a natural expression of the Infinite.
There are also many people - spiritual seekers - who go around "seeking" this state of consciousness. It is not something you "seek", but rather something you accept and then live it, because it is already what you are. Seeking it is pretty much like a fish in water, swimming madly around trying to figure out where is water.
While this Spirit is not limited to the air- it is in the air and in absolutely every spark of creation - the closest element I could use to describe it is air. You don't go around looking for air to breathe - you just breathe it. And together with the air, you breathe in the spirit, the life-force.
There are some people who embark upon the spiritual path and then they hear from someone that it doesn't matter whether they do any spiritual practice or they don't because they are already It. But there is a big difference between being It and truly knowing that you are It, experiencing yourself as It. This would compare to having all the treasure of the world, yet not having a clue how to access it, how to use it and how to do with it, and most importantly how to live in harmony with It, how to express It. If they struggle to make a living, if they are unhappy, if they are not feeling truly fulfilled, then they have not yet gotten acquainted with It. They may know Spirit as an idea, but not as a real, living experience. When you truly KNOW IT, then you LIVE IT.
In order to get anywhere with your development of supernatural powers, you have to leave the world of physical dimension - in your consciousness - and to begin looking at a world from the perspective of energy, consciousness and spirit.
The entire practice is summed up beautifully in "Life and Teachings of the Masters of the Far East":
"Stop for a moment and just think of the allness of God or Primal Cause with no beginning or end, with universal scope, and surround yourself in this. As you become faithful and worship this, and this alone, ONE GOD, ONE ALMIGHTY PRESENCE - you will find that the vibrations of your body will change from the human to the God or Primal vibration. As you think, live, move and become one with this vibration, you do worship; and what you worship, you idealize, you become."
There are many ways and methods of practice to help you to get into the correct mind-set, and one of the books that can help you in this respect is A Course in Miracles. If you wholeheartedly work with A Course in Miracles, your perception of the world will completely change.
This brief excerpt that follows regarding the development of supernatural powers is extracted from Yoga Sutras of Patanjali.
All supernatural powers are developed through the practice of concentration, meditation and absorption.
Concentration consists of holding the mind fixed upon the Inner Light and the power/ability you desire to attain. To do this, you can imagine yourself standing in the center of the sphere of dazzling, brilliant white Light, allowing everything else to fade from your awareness.
Meditation is a prolonged concentration. Ordinarily a thought-wave arises, remains in the mind for a moment, and then subsides, to be succeeded by another wave. In the practice of meditation, a succession of identical waves are raised in the mind; and this is done so quickly that no wave is allowed to subside before another rises to take its place. The effect is one of perfect continuity.
After your mind has been focused on a single thought through meditation for some time, you'll reach the stage of absorption. At this point you'll feel that you have completely merged with the object of your focus, that there is no longer separation between you and what you are contemplating, but instead that you have become the very idea you have been focused on.
It has been said that if the mind can be made to flow uninterruptedly toward the same object for 12 seconds, this may be called concentration.
If the mind can continue in that concentration for 12 x 12 seconds (2 minutes and 24 seconds), this may be called meditation.
If the mind can continue in that meditation for 12 x 2 minutes and 24 seconds, (28 minutes and 48 seconds) this may be called lower absorption.
And if this absorption can be maintained for 12 times that period (5 hours, 45 minutes, and 36 seconds) this may be called total absorption.
By completing the above process on any specific ability or strength, one obtains that ability or strength.
All these and many other powers of knowledge may also come to one whose mind is spontaneously enlightened through purity.
The more specific list of powers is listed in The Yoga Sutras of Patanjali.
In simple words, all that this excerpt from The Yoga Sutras of Patanjali says is to sit down and focus upon that (the ability) you desire to express, until you become it within you, in your inner world.
While all these powers may be impressive in the worldly sense, they are considered obstacles on the spiritual path, or rather, attachment to these powers is considered an obstacle, as is attachment to anything else.
As I mentioned above, all the powers you desire and even some you might not even have dreamed of will emerge spontaneously if you sit down in meditation and pretend that you already are ALL THERE IS, until the realization flashed into your conscious awareness from within you. This, too, does not require struggle, but rather a childlike playful spirit. The more lighthearted your approach, the faster will you make progress. If you open your heart completely to the Infinite, you will progress at a lightning speed, simply because through love you will demonstrate that you are completely willing and ready to KNOW YOUR TRUE NATURE now.