While continuously staring at the tip of the nose, a learned yogī practices the breathing exercises through the technical means known as pūraka, kumbhaka and recaka — controlling inhalation and exhalation and then stopping them both. In this way the yogī restricts his mind from material attachments and gives up all mental desires. As soon as the mind, being defeated by lusty desires, drifts toward feelings of sense gratification, the yogī should immediately bring it back and arrest it within the core of his heart.