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The purpose of this brief commentary is to correct some misinformation that appears in many sport psychology writings. As the title of this paper indicates, the author discusses two historical giants in social psychology, Norman Triplett and Kurt Lewin, who are often cited in sport psychology publications. The problem with the typical commentary on these two social scientists and the events they are linked to is that the discussions of them are typically inaccurate, as Strube, Stroebe, and Bedeian indicate and the author next elaborates on.

The extent to which humans consider themselves part of a group versus a collection of individuals is termed groupness. Despite a rich history in other domains, research examining the construct in physical activity settings is only beginning to emerge. Indeed, seminal research from other domains and recent efforts in physical activity highlight the importance of groupness perceptions for a range of outcomes. This paper provides an overview of the current groupness conceptualization in physical activity, presents research conducted in exercise and sport contexts, and, most important, provides a roadmap highlighting future research avenues. Proposed lines of enquiry relevant to physical activity include the development of a context-specific conceptualization, advances in methodologies to facilitate measurement and analysis, and the importance of contextualizing groupness research within physical activity settings.

In taking a senior perspective, the author first steps back and offers an historical view and then offers her senior advice for moving forward. When the North American Society for the Psychology of Sport and Physical Activity (NASPSPA) was in its infancy (early 1970s), the psychology subarea was known as social psychology and physical activity, and our research largely followed social psychology theories and research methods. In subsequent developing years, our research split into sport psychology and exercise psychology, with more focused research lines that moved away from social psychology and physical activity. While the more focused research builds our evidence base, that research has little impact on the wide range of participants and professionals. To have greater impact, we can reclaim the “social,” and we can take a more inclusive view of physical activity. We must recognize and highlight the powerful and complex role of “social” context and relationships and directly engage with professionals and participants in those real-world settings. We need more scholars who partner with other (nonacademic) professionals, teach those future professionals, and engage with their community and the public to enhance our real-world impact.

The authors conducted a systematic review of children’s and adolescent’s physical activity by schoolyard location. PubMed and Web of Science were searched and articles were selected that included 3- to 17-year-olds and specifically examined and reported physical activity by schoolyard location. The primary outcomes of interest were the percentage of total time or observation intervals spent in each location and percentage of time or observation intervals in each location being sedentary or participating in moderate to vigorous physical activity. Included studies (N = 24) focused on preschoolers (n = 6), children (n = 11), adolescents (n = 2), or children and adolescents (n = 5) and primarily used direct observation (n = 17). Fields, fixed equipment, and blacktop were all important locations for physical activity participation, but there were differences by age group and sex. More research is needed that uses consistent methodology and accounts for other factors such as time of year, provided equipment, and differences in schoolyard designs.

Movement is essential to the human experience, and efficient biomechanics facilitate effective action across the breadth of tasks one encounters in life. The concept of movement efficiency has been investigated and explored through a variety of means including biomechanical modeling, simulation, and experimental manipulation. Observations of elite performers for a given movement task serve as an additional line of insight into efficiency, as their movements have been driven toward optimization via competitive pressure. The authors first discuss the concept of efficiency in biomechanics from a qualitative perspective and the broad tools with which we explore it. They then highlight biomechanical investigations of elite performers and their contributions to our understanding of efficiency. Examples from various classes of movements illustrate unique insights of the elite performers in informing our understanding of movement efficiency.

It was not too long ago that many people referred to concussion as a “hidden injury” and a “complex injury for which we still had much to learn.” We still have a lot to learn about these injuries, but because of the advancement of concussion research we are better informed today than we were just a decade ago. Much of this work began in the early to mid-1990s with studies aimed at equipping clinicians with better concussion-assessment tools. We needed to remove the guesswork, so more systematic and objective concussion-assessment batteries (sideline and clinic) that included symptom checklists, cognitive tests, and balance assessments were developed and validated. As a result, it became easier to detect and/or rule out concussions and to track recovery for several days postinjury. From 2009 through 2014, all 50 states and the District of Columbia passed concussion legislation requiring concussion education for high school and youth athletes, among other things. This was a critical period in which more emphasis was placed on concussion prevention, ultimately leading to increased reporting of these injuries and a reduction in the number of unreported and undiagnosed concussions. More recently, the corpus of science has evolved to identify potential blood and neuroimaging biomarkers to complement the traditional-clinical assessment tools, and newer studies are focused on treatment after concussion—challenging the notions that “rest is best” and that the effects of concussion are permanent and immutable. The research is ongoing, and several large multisite studies will yield important findings to help guide clinical decision making in the next few years.

Intense exercise in extreme heat can increase the risk of developing exertional heat stroke (EHS). EHS is 100% survivable with appropriate care, and it is imperative that health care professionals recognize predisposing factors that may increase susceptibility to EHS. Understanding risk factors for EHS will enable clinicians to create effective prevention strategies to improve exercise heat tolerance and mitigate EHS risk. This review addresses new perspectives on risk factors for EHS that focus on hydration, heat acclimatization, medical conditions, climate change and policies, medications, and strength and conditioning sessions.