The main sources of Prana are the Sun , the Earth and the Cosmos and the prana they give is known as Sun prana, Earth prana and Cosmic prana. Other sources of Prana are the air we breathe, the food we eat, water we drink, trees, holy persons, holy places, crystals, certain geometric structures, objects like holy books , certain symbols etc.
There are many types of Prana exercises which have been practised since ancient times in different countries to generate and increase the flow of prana in the body to stay healthy like Yoga in India, ChiKung and TaiChi in China and Akido in Japan.
Pranayama a part of Indian Yoga in which various types of breathing is done to manage the flow of prana into the body in order that the person can enjoy a long healthy life.
When we breathe in, it is not only the oxygen that we inhale, we also take in silver coloured very fine particles of energy present in the atmosphere. Each of this particle is the air prana.
Most of us are unconsciously obtaining prana from all above sources but in a manner where it is just a part of our existence and habit. We are doing it without awareness and there is no measure of the quantity of this prana and it’s effect on our aura.