I was wondering how are polo horses trained on a daily basis ?

I'm not a a polo payer but I keep a couple of my horses at a polo field and they seem to simply get the horses in work by putting them on walkers or exercised in big groups with a rider on one horse leading about 4 other horses galloping around. For actual training this isn't done as much on a daily basis (I think there's just too many horses) but they sometimes play mini/fun games and I guess that's where they would be training the horse? Don't hold me to this I could be wrong!
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