Yannis Theodorakis is a professor of Sport Psychology in the Department of Physical Education and Sport Science at the University of Thessaly, Greece. He has published more than 34 books and chapters, and more than 230 articles in the areas of physical education, sport and exercise psychology, health psychology, Olympic education, health education, goals setting, self-talk, and attitude and behaviour relationships. He has been involved in several projects related to physical activity promotion, health education, exercise and smoking, exercise program in patients with dementia by using virtual reality, the role of sports in addiction recovery, and equality in society through sports.