By drawing up from below (Mûla Bandha) and contracting the throat (Jâlandhara Bandha) and by pulling back the middle of the front portion of the body (i.e., belly), the Prâṇa goes to the Brahma Nâdî (Suṣumnâ). Note - The middle hole, through the vertebral column, through which the spinal cord passes, is called the Suṣumnâ Nâdî of the Yogîs. The two other sympathetic cords, one on each aide of the spinal cord, are called the Idâ and the Pingalâ Nâdîs. These will be described later on.