Mark R. Beauchamp, Ph.D., is a Professor in the School of Kinesiology at The University of British Columbia (UBC), Canada. He is a Chartered Psychologist with the British Psychological Society and Editor of Sport, Exercise, and Performance Psychology, which is the official publication of Division 47 of the American Psychological Association. Dr. Beauchamp’s research primarily focuses on the social psychology of groups within exercise and sport settings, with funding for his research program provided by agencies such as the Canadian Institutes of Health Research, Social Sciences and Humanities Research Council, and the Canadian Foundation for Innovation.Mark Eys, Ph.D., is a Professor in the Departments of Kinesiology/Physical Education and Psychology at Wilfrid Laurier University, a former Canada Research Chair (2009–2019), and Laurier Research Chair in Group Dynamics and Physical Activity. Funding for his research has been provided by the Social Sciences and Humanities Research Council of Canada, the Canadian Foundation for Innovation, and the Ministry of Research and Innovation (Province of Ontario).

• 1. Evolutionary Perspectives on Cooperative Sociality in Exercise and Sport2. Social Influence, Conformity, and Contagion in Sport and Exercise Groups3. Identity Leadership in Sport and Exercise4. Thriving and Resilience in Sport and Performance Teams5. Social Norms (Revisited) in Physical Activity Promotion6. Teamwork and Team Effectiveness in Sport7. Followership in Sport Teams and Physical Activity Groups8. Collective Emotions and Interpersonal Emotion Regulation in Sport9. Group-Based Physical Activity and Mechanisms of Behavior Change10. Harnessing the Power of Group Dynamics to Increase Physical Activity in the School Setting11. Diversity, Equity, and Inclusion within Sport and Physical Activity Groups12. Team Mental Models in Sports