Mudras are gestures that facilitate the body’s natural flow of energy. To me, mudras are magical.  Hastha mudras in particular, are easy to learn and provide a method of aligning subtle energies.  Some mudras use the entire body, others, such as hastha mudras use only the hands. Each mudra has a subtly different focus and mudras can be combined with a slow or energetic physical practice, dependent on your need.