Nadi Shodan Pranayama
It is the king of pranayama
Benefits:

* Cleanses your nadi
* Prepares you for dharna(concentration)
* Brings mental peace, calmness
* Cleanses the brain
* Help to find a rythmetic breath
* Help to breath deeper and make your
chest bigger

Precautions:

* Never practice out of your capacity
(it may lead to craziness)
* Learn from a good teacher
(do not practice just by reading a text)

Step by Step:

1. Sit in padmasan, or comfortable seated position.
2. Straighten your spine.
3. Place the left palm on the knees, form a circle with thumb and forefinger and extend the remaining fingers straight(this is known as gyan-mudra).
4. Hold your nose with right hand. Thumb on right nostril, forefinger and middle finger on third eye(agya chakra), index and little finger on left nostril.
5. Relax your shoulders and fingers.
6. Open your left nostril by lifting your index and little finger and inhale for 4 counts.
7. Close you left nostril and hold your breath for 16 counts.
8. Open your right nostril by lifting your thumb and exhale for 8 counts. Inhale(4 counts) from right nostril, hold your breath(16counts), exhale from left nostril(8counts). This is one cycle.
9. Repeat for 12 cycles.
10. The inhalation, hold, exhalation should be done in a 1:4:2 ratio.