Win Wenger, in How to Increase Your Intelligence, noted that "only those brain cells which are close to an ample capillary blood supply are thoroughly developed. Away from such source of supply, brain cells remain undeveloped and useless." Wenger describes "upside down activities" to increase oxygen supply to the brain. He states, "In short, you can much improve the physical state of your entire brain." A brain that is better nourished simply works better.
Some people claim that increasing the circulation of blood to the head through inversion may also improve the color and tone of your skin, stimulate mental alertness, and improve hearing and vision. In addition, some claim that hair will be healthier, and may even grow again, if the scalp is well supplied with blood.