This document defines mudras as hand positions used in yoga that affect energy flow in the body. It describes several types of mudras, including Gyan mudra which joins the thumb and index finger to raise air element levels, and Prana mudra which joins fingers to increase vitality and activate the root chakra. Each mudra is said to provide specific health benefits such as clearing psychic centers, purifying the biofield, reducing stress, and strengthening the immune system. Diagrams illustrate the proper formation of various mudras.