I’ve found something useful on Mongrels United fb-site: It’s a polo training document for players of all levels, English+Spanish below:
https://drive.google.com/file/d/16uka4fkSEakS6KPHXYikaC5o90PSFW0m/view?usp=drivesdk
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check out this post: Bike polo drills
there are some other useful resources linked as well (including emmets solo-polo training document you posted here 
)
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