The Blissful Body of the Yogi(ni): Yidam Practice & Yoga Asana

Khenpo Tsultrim Gyamtso Rinpoche, a Tibetan yogi often compared to the great Milarepa, when addressing the issue of Yidam practice within the Vajrayana vehicle of Tibetan Buddhism, has said: It is the blissful body of the yogi or yogini that is the true Deity. So what might this mean? And how, if at all, is it (or could it be) related to the practice of Yoga asana? Let