Sit in Padmasana or Siddhasana. Bend your index fingers and place them at root of your thumbs. Spread the remaining three fingers forward, all joined together. Now put your hands on your knees with palms facing upwards.
One should sit in any of these asanas while practicing Dhyana. The vertebral column, neck, head and waist should all be kept straight. These postures strengthen the nerves of the spinal cord and make them elastic; the sense organs are controlled; the respiration gets balanced; concentration increases; the movement of Prana in Sushumna is regulated because of the straight position of the spinal cord. That is why these asanas have been found most suitable for pranayama and Sadhana.