Resources, information and data on martial arts in general
Meyer, M.J., Molle, A., Judkins, B.N. and Bowman, P., 2021. Martial Arts in the Pandemic. Martial Arts Studies, 11, pp.7–31. DOI: http://doi.org/10.18573/mas.134
I will endeavour to link as many open-sourced articles and resources as I can.