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Adaptive behaviour change is central to improving population health, yet poor adoption of health-enhancing behaviours contributes to noncommunicable diseases and so remains a global concern. Research on physical activity behaviour change has continued to expand and evolve since the turn of the millennium, guided by diverse theoretical approaches-from social cognitive theories, organismic dialectical approaches such as Self-Determination Theory, dual-process frameworks, and integrated practical models and taxonomies.

Childhood is a critical period for the development of movement behaviours such as physical activity, sleep and sedentary behaviour. The PLAYCE Cohort was established to investigate how movement behaviours change over early to middle childhood, across key behaviour settings and relationships with health and development. An overview of the PLAYCE cohort, summary of key findings to date, and future research opportunities are presented.

High levels of sedentary behaviour are associated with poor child health outcomes such as obesity. Early childhood education and care (ECEC) services are a key intervention setting. Most ECEC policy-based interventions focus on children's nutrition and physical activity with few aimed at children's sedentary behaviour.

Youth sports programs provide an opportunity to embed mental health and wellbeing programs to reach young people with mental health support. The aims of this study were to (a) examine mental health outcomes from a youth sports program including a mental health program (Life-Fit-Learning) in adolescent boys and girls, and (b) among the larger cohort of adolescent boys, to examine whether partial or full completion of Life-Fit-Learning yielded different outcomes for boys within healthy and high-risk ranges for anxiety, depression and behavioral concerns. 

Regular exercise can be beneficial for people living with a severe mental illness. By better understanding the perspectives and challenges of adults with severe mental illness who are engaged in exercise, we can enhance the design and implementation of exercise programs to better support their mental health and recovery.

Assessment of motor competence is critical for planning and monitoring children's development. However, many assessment tools require time, training, and resources not available to most teachers. We aimed to evaluate the external aspect of construct validity of a rapid product-oriented fundamental movement skill assessment tool designed specifically for primary education settings.

There is currently limited data regarding the physical activity behaviors of trans and gender diverse people (including binary and non-binary identities; henceforth trans). The aim of this review was to synthesize the existing literature in this area, with a focus on physical activity behaviors as they relate to health (e.g. health benefits, risks of adverse health outcomes). 

Current methods for assessing the healthfulness of 24-hour movement behaviours (sleep, sedentary time, light physical activity, moderate-to-vigorous physical activity) use binary classifications that fail to capture their continuous and compositional nature. This study introduces a percentile-based scoring and visualization approach to evaluate the healthfulness of movement behaviour time-use compositions, using social-emotional development in early childhood as an example.

A main challenge identified by youth during exercise and sport is the lack of knowledge and awareness around type 1 diabetes (T1D) particularly in community sport settings. Working with youth living with T1D, parents and community sport coaches, our team has developed resources for the T1D and sporting community. This study was to evaluate the acceptability and usability of the resources.

Physical activity can support physical and mental health among children living with chronic health conditions; however, programmes must be tailored to their specific needs to support participation.