Brief 3-minute activities may be ideal as daily settling and focusing practices in the classroom.
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Gouda, S., Luong, M.T., Schmidt, S., & Bauer, J. (2016). Students and teachers benefit from mindfulness-based stress reduction in a school-embedded pilot study. Frontiers in Psychology, 7:590, 1-18. https://doi.org/10.3389/fpsyg.2016.00590
Schussler, D. L., Oh, Y., Mahfouz, J., Levitan, J., Frank, J. L., Broderick, P. C., Mitra, J. L., Berrena, E., Kohler, K., & Greenberg, M. T. (2021). Stress and well-being: A Systematic case study of adolescents' experiences in a mindfulness-based program. Journal of Child & Family Studies, 30(2), 431–446. https://doi.org/10.1007/s10826-020-01864-5
Shankland, R., & Rosset, E. (2017). Review of brief school-based positive psychological interventions: A taster for teachers and educators. Educational Psychology Review, 29(2), 363–392. https://doi.org/10.1007/s10648-016-9357-3