Andreas Ivarsson, PhD, is an assistant professor in sport and exercise psychology at Halmstad University in Sweden. He is also currently working as a sport psychology consultant with athletes from different team sports. His research interests include psychological aspects related to sport injuries and sport performance, psychological predictors of drop-out from youth sport, and statistical and methodological aspects within psychological research.

Urban Johnson, PhD, is a professor in sport and exercise psychology at Halmstad University in Sweden. He is also the appointed research leader for the research group "Sustainable sport and physical activity" at the Centre for Research on Well-being, Health and Sport at Halmstad University and a member of the research board at the Swedish National Centre for Research in Sports in Stockholm. His research interests include psychological aspects of sports injuries; leadership and coaching in sport; and applied sport psychology