Vijnana Bhairava Tantra · Dharana 29 · Verse 52
Body burned from the foot up
Sit with the eyes closed. Imagine a fire beginning at the right foot and moving upward until the whole body is consumed. This is not an ordeal, and it is not an invitation to pain. It is a way of loosening your grip on the image of the body. Remain as the one who watches. When the picture of the body has burned away, stay with the watcher. Do not rebuild the picture out of habit.
Older line
Picture the fire of time rising from the foot and burning your own body away. At the end, a calm radiance appears.