The method, developed by Edmund Jacobson in the 1930s, is one of the most well-known psychophysical therapeutic techniques aimed at reducing muscle and emotional tension by teaching a person to consciously tense a group of muscles for a short time and then slowly relax them, observing the difference between tense and relaxed states. This method is based on the principle that chronic muscle tension is directly related to emotional reactions such as anxiety and anger, and that relieving this tension helps calm the autonomic nervous system, especially the sympathetic nervous system, which is responsible for the fight-or-flight response. Regular practice promotes a deeper awareness of one’s body and stress levels, increasing its ability to control physical and psychological responses to stress.