One is often asked, what kind of Asana is best for Mantra japa, so that one may quickly realize the fruits of one's chanting or meditation?
Generally, Rishi-Munies in the ancient texts, list four kinds of Asanas best suited for this purpose...Namely- Padmasana, Siddhasana, Swastikasana, and Sukhasana...
Of the four kinds of Asana, Padmasana is considered best for this purpose.
One can sit on a 'kush' or dried grass prayer mat or any other prayer mat suitable to you. Now cross your legs such that the right foot is lifted on to the left thigh and the left leg is lifted on to the right thigh. Keep your head, neck, and spinal chord of your back straight in a line. This allows for free flow of energy and is the best favored pose for Mantra reciting.