Balayam Yoga (Rubbing nails): This yoga asana was made famous by Baba Ramdev. Curl the fingers of both hands inwards towards your palm. Bring the nails of both your hands in contact with each other and start rubbing them vigorously ensure leaving out the thumbnails.
By doing this, the roots of the hair follicles connected to the fingernails pump energy to the scalp needed for hair growth.