This system of yoga for controlling the breathing process is called pranayama, and in the beginning it is practiced in the hatha-yoga system through different sitting postures. All of these processes are recommended for controlling the senses and for advancement in spiritual realization. This practice involves controlling the airs within the body so as to reverse the directions of their passage. The apana air goes downward, and the prana air goes up. The pranayama-yogi practices breathing the opposite way until the currents are neutralized into puraka. equilibrium. Offering the exhaled breath into the inhaled breath is called recaka. When both air currents are completely stopped, one is said to be in kumbhaka-yoga. By practice of kumbhaka-yoga. one can increase the duration of life for perfection in spiritual realization. The intelligent yogi is interested in attaining perfection in one life, without waiting for the next. For by practicing kumbhaka-yoga. the yogis increase the duration of life by many, many years. A Krishna conscious person, however, being always situated in the transcendental loving service of the Lord, automatically becomes the controller of the senses. His senses, being always engaged in the service of Krishna, have no chance of becoming otherwise engaged. So at the end of life, he is naturally transferred to the transcendental plane of Lord Krishna; consequently he makes no attempt to increase his longevity. He is at once raised to the platform of liberation, as stated in Bhagavad-gita
The description of the banyan tree is further explained here. Its branches spread in all directions. In the lower parts, there are variegated manifestations of living entities — human beings, animals, horses, cows, dogs, cats, etc. These are situated on the lower parts of the branches, whereas on the upper parts are higher forms of living entities: the demigods, Gandharvas and many other higher species of life. As a tree is nourished by water, so this tree is nourished by the three modes of material nature. Sometimes we find that a tract of land is barren for want of sufficient water, and sometimes a tract is very green; similarly, where particular modes of material nature are proportionately greater in quantity, the different species of life are manifested accordingly.