the 'thunderbolt' pose; a kneeling posture with buttocks resting upon the heels.

("The Adamantine Pose") A posture for meditation or Alchemy. Described by Swami Sivananda as follows: "Those who sit in this Asana have a quite steady and firm pose. They cannot be easily shaken. The knees are rendered very hard. Merudanda becomes firm and strong. This Asana resembles more or less the Namaz pose in which [..]