The right side of your body is ruled by the sun and reflects the masculine aspects of your personality. The left side of your body is ruled by the moon and reflects feminine aspects of your personality. Each finger on your hand is also ruled by individual celestial bodies.
Thumb: Mars and is related to your ego and will
Index finger: Jupiter and is related to growth, abundance and knowledge
Middle finger: Saturn and is related to patience, emotional control and ambitions
Ring finger: the Sun and is related to vitality, health and heart matters
Little finger: Mercury and is related to secrets, creativity and communication
Mudras can be practiced anywhere, all you require is a little bit of time: three minutes is all you really need for the mudra to start taking effect. Most mudras can be held for 3-15 minutes each depending on how much time you have to devote to the practice.