Sit on your heels with your knees spread wide. Bring your forehead down to the ground and relax in this position with the arms stretched forward and the palms together. This posture is called Guru Pranam. Breathe long and deep through the nose for 1-3 minutes. Then slowly sit up straight, take a few deep breaths and relax. Try this simple pranayam (breathing technique) coupled with a yogic asana (posture) for its cleansing effect.