Biofeedback is a technique that teaches people how to control involuntary bodily functions like breathing, muscle tension, and heart rate through the use of electronic or electromechanical devices that provide feedback on these physiological processes. It involves learning to control external signals and eventually internal cues to gain awareness and control over one's body. Biofeedback sessions with a trained professional typically involve sensors attached to the body to monitor functions and provide audio or visual feedback to help the individual learn control through relaxation techniques and practice. While not a cure, biofeedback has been shown to help treat various conditions involving muscle tension and stress and is gaining wider acceptance in mainstream healthcare.