Physical activity behaviors children developed during their childhood have a long-term impact on their lifelong physical activity habits and healthy development, the increased levels of sedentary behavior and obesity call for immediate actions, especially during the coronavirus disease 2019 (COVID-19) pandemic (Sallis et al., 2020). The COVID-19 pandemic can lead to mental health problems such as acute stress disorder and post-traumatic stress disorder (PTSD), as well as other physical health problems such as obesity and a sedentary lifestyle (Margaritis et al., 2020). Exposure to this traumatic COVID-19 pandemic especially impacts health and behavioral outcomes for school-aged children (Rundle et al., 2020). Thus, youth sport programs should provide favorable environments that introduce school-aged children to beneficial lifestyle behaviors and encourage them to engage in regular physical activity with appropriate social distancing (Chen et al., 2020). Furthermore, positive motivation in youth sport programs could prompt children to adopt physically active and healthy lifestyles as adults (Chen et al., 2020; Gu & Zhang, 2016; Shen et al., 2020). Despite the assertion that youth sport programs can play an important role in the promotion of children's physical activity and health-related outcomes (i.e., physical health, mental health, social health, and cognitive health), to date scholars and researchers have not systematically investigated the environmental and psychosocial factors that influence physical activity and health-related outcomes within youth sport settings during the COVID-19 pandemic (Moore et al., 2020). To encourage school-aged children to adopt a healthy and physically active lifestyle during the COVID-19 pandemic (Gu et al., 2018; Sallis et al., 2020), a clear understanding of the environmental and psychosocial factors that support children's motivation becomes an important issue for promotion of physical activity and health-related outcomes such as health-related physical fitness, cognition, quality of life, and well-being (Gu et al., 2012).