Trul khor ('magical instrument' or 'magic circle;' Skt. adhisāra), in full tsa lung trul khor (Sanskrit: vayv-adhisāra 'magical movement instrument, channels and inner breath currents'), also known as yantra yoga, is a Vajrayana discipline which includes pranayama (breath control) and body postures (asanas). From the perspective of the Indo-Tibetan Buddhist traditions of Dzogchen, the mind is merely vāyu (breath) in the body. Thus working with vāyu and the body is paramount, while meditation, on the other hand, is considered contrived and conceptual.