My daughter and I half lease a horse from her trainer. The horse is new to the barn and has been out of work for at least 6 months prior to coming to the barn at the beginning of July. The lease allows us to ride for 1 to 1 1/2 hours on Monday, Wednesday and Saturday. The horse is used of other lessons so I asked the trainer when we signed the lease what times he might be used for lessons so that we would avoid coming at those times. She said that it shouldn't be a problem since he is really only used for lesson on Tuesday. Well tonight we get to the barn and realize he is being used for a lesson for one of the more advanced students. While it will delay us a bit I was ok with it because this horse is unbalanced at the canter and having someone with more experience work with him will be good. So we set down and watch the lesson. They are doing a lot of trot work and everytime he became unbalanced she would trot him in multiple small circles (10m or less in diameter). After a bit they worked on getting him to canter where he is really unbalanced. I watched him get more and more resistant in his body language. Finally they return back the trot and I notice it looks like he is moving a bit funny, but I am not sure because I am not an expert. So the lesson end and we change saddles and start to walk him around and he is bobbing his head at each step just a bit. Trainer says he is just tired. This is definitely true. He is so hot, tired and sweaty I had already decided that it wouldn't be fair to him to do much more than walking and a tiny bit of trotting with my daughter and I decided not to ride because I am heavier and I didn't think it would be good for him at that point. Well after walking him around the arena a couple times the trainer admits that he is indeed off. So we wash him off and put him away. I know that horse can come up lame at any point, but I am a bit perturbed that even if he wasn't lame he was worked so hard that it wouldn't have been fair to ride him as hard as she normally does. Thanks for letting me vent.