The vajra, the thunderbolt, is said to be the weapon of Indra king of the devas or gods, just as the mind is the king of all the sens. vajra is also the major nadi directly connected with the genito-urinary system which regulates the sexual energyin the body. cControl of vajrs nadi leads to sublimation and control over sexual energy. the vajrasana series, is therefore, very beneficial for the reproductive as well as the digestive organs, is also reasonably easy to perform.