The Vital Force
Prana or the vital force is expended in thinking, willing, acting, talking, writing, etc. A healthy and strong man has an abundance of Prana or nerve force or vitality. The Prana is supplied by food, air and solar energy. The supply of Prana is taken up by the nervous system. It is absorbed by breathing. The excess of Prana is stored in the brain and nerve centers. When the seminal energy is sublimated or transformed, an abundance of Prana is supplied to the system. It is stored in the brain in the form of Ojas.
The Yogi stores an abundance of Prana through the regular practice of
Pranayama, just as a storage battery can be made to store electricity. That Yogi who has stored up a large quantity of Prana radiates strength and vitality all around. He utilizes this divine energy for practicing deep meditation.
#SriSwamiSivananda