The document discusses various relaxation techniques that can be used by athletes to improve performance, including progressive muscular relaxation, autogenic training, meditation, yoga, tai chi, biofeedback, hypnosis, hydrotherapy, sports massage, deep breathing, mental rehearsal, visualization, positive self-talk, exercise, music, and humor. These techniques help to reduce stress, anxiety, muscle tension, and arousal levels, allowing athletes to feel more in control and mentally prepared during competition. Regular practice is important to learn the techniques and make them automatic.