In Maha Vedha, press the Kanda with the left heel. Perform Mula Bandha. Place the right foot on the left thigh. Then perform Jalandhar Bandha by pressing the chin against the chest. Place both palms on the ground and then balancing the body on the hands raise the buttocks with the left heel pressing against the Kanda, then bring it down on the ground(gently). Perform inhalation of breath at the beginning of the practice and after few times of striking, exhale.
This exercise is a great purifier of the body and the mind. It also awakens Kundalini Shakti and leads to the attainment of Samadhi.