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Background: Physical activity (PA) is considered an important factor affecting academic achievement (AA). Different intensities of PA affect mental engagement (ME), which, in turn, affects AA. However, the role of ME in the relationship between PA and AA remains unclear. Objective: This study aimed to examine the mediating and/or moderating role of ME (i.e. cognitive flexibility [COGFLEX], metacognition [META] and competitiveness achievement motivation [COMPETE]) in the relationship between PA (both moderate- and vigorous-intensity activities) and AA. Method: Structural equation modelling was used to build a mediated moderation model. A total of 68,144 students from eight economies who participated in the 2018 Programme for International Student Assessment were included in the study. Results: Moderate-intensity physical activity (MPA) was significantly positively correlated and vigorous-intensity physical activity (VPA) was significantly negatively correlated with AA in adolescents. COGFLEX, META and COMPETE were found to play a significant mediating role in the relationship between both types of PA (MPA and VPA) and AA. COGFLEX and COMPETE were found to moderate the relationship between VPA and AA. Conclusion: ME plays a mediated moderation role in the relationship between the intensity of PA and AA. The theoretical and practical implications of these findings are discussed.

Agriculture affects and is affected by climate change. The development of climate-smart agriculture (CSA) is an effective way for agricultural production to cope with climate change. The rice-crayfish coculture system is a combination of the concept of climate-smart agriculture with the experience of traditional Chinese mixed crop-fish systems. This paper reviews the advantages and potential risks of rice-crayfish coculture with respect to climate, ecological environment and economic benefits, and summarises the successful management strategies and operation experiences during the implementation of this CSA practice in Qianjiang City. We also introduce various mixed crop-fish systems in China and suggest the potential of using wetland resources to develop mixed crop-fish systems and CSA. [ABSTRACT FROM AUTHOR]