During this meditation training exercise, Peter encouraged concentrating attention on different areas of sensation varying from the upper lip, rim of the nostrils, the nasal septum and passages, the sinus cavities, back of the throat, soft palate/uvula, hard palate, upper gum and teeth, upper tongue and inside of the upper lip. Each of these areas are stimulated by the breathing in and out cycle. The four elements were described: Earth (hardness/pressure), air (movement), fire (varying temperatures) and water (cohesion/fluidity) as reference points in the process of mindfulness of breathing.