The picture here doesn't justify my post. But, if you happen to read this, my purpose here is to share with you, why only one-tenth of the brain is used by an average individual and what role Pranayama plays in enhancing that. "As one works with prana and its quantum and quality improve, the dormant areas of the brain awaken. Normally only one-tenth of the human brain is active and the other nine parts remain inactive. This is because a high level of energy is required for the whole brain to function simultaneously. The yogic practices are able to supply such a quantum of energy and awaken the genius in an average individual. However just a few rounds of pranayama performed hurriedly will not achieve this. Sustained practice with deep concentration, acute awareness and unshakeable faith are the requisites of a yogi." - "Prana and Pranayama"
P.S. To start practicing, please follow thorough guidelines. Reach out to an expert or if you wish to begin on your own, my suggestion would be to read 'Prana and Pranayama' by Swami Niranjanananda Saraswati.