I would be surprised if the physio didn't recommend giving your horses 24 hours off afterwards just so everything settles with them. I know that in doing Equine Touch I always tell the owners and handlers to do a normal routine for turn-out and feeding, but just no riding or even grooming for 24 hours as the use of brushes (for ET anyway) can literally undo the work I've done! I think with all bodywork routines, it is a good idea to make sure there is extra fresh water available as they may go through a detox process at the same time. Hope your gang have a good workout and there's nothing major to sort!
Edited to add: one of the horses I do ET on needs a full three days off after his session, but that is unusual! You will find out for yourself if the horse is comfortable during a ride later on, or not :biggrin: