This systematic review of RCTs of yoga for school-aged children identifies heterogenous interventions and outcomes, but positive effects that deserve further study.

Khunti, K., Boniface, S., Norris, E., De Oliveira, C. M., & Shelton, N. (2022). The effects of yoga on mental health in school-aged children: A Systematic Review and Narrative Synthesis of Randomised Control Trials. Clinical child psychology and psychiatry, 13591045221136016.

https://journals.sagepub.com/doi/full/10.1177/13591045221136016