Mudras - or yoga of the hands - is an ancient Hindu tradition described in detail in this very readable and clear book. Fingers and/or thumbs form particular gestures, diagrammatically illustrated, and each one is linked to a specific physical, emotional, or spiritual health need. For example, the Shakti Mudra is calming and helps you sleep, whereas the Pran Mudra activates the root chakra and stimulates vitality. Some 46 Mudras are demonstrated. They are simple, can be done anywhere, ( for example - in a queue ), and there is a great deal of anecdotal evidence to testify to their healing power. Try them for yourself!