What is Madalasa Vidya
On accomplishing this Vidya, a person becomes capable of increasing or decreasing the size of his body according to his wish. Lord Hanuman had miniaturized his body through this Vidya while entering the city of Lanka.
The average height of a human being is six feet. Through this Vidya a person can reduce the size of his body to the size of a mosquito and can even enlarge his body to a size of over hundred feet.
A few years back a conference of Yogis was held on the Bhairav hill, near Dehradun and in this conference Tailang Baba (an ascetic) demonstrated this miraculous practice before hundreds of Yogis. This Vidya is almost extinct today and in my opinion only Tailang Baba has accomplished it.