Siddhasana (adept's pose)
     The shape of this asana is like a lion, hence the name.
1. Sit erects with the spine straight.
1. Stretch out the legs.
2. Catch the left foot, bending it at the knee.
3. Place the heel such that it presses against the reproductive organ. Lifting the right foot, place the right heel over the left ankle.
4. Place hands in Brahmamudra, with the right palm above the left palm, both palms upwards, near the navel.
  Increase as much as is convenient.
This asana helps in obtaining victory over lust, awakening energy, circulation of the vital flow in the spine and cessation of mental tendencies.
It is very good for spiritual practice of Brahmacharya (celibacy).