I have recently been taking care and riding a friends gelding. This horse wasn't ridden in while and he is very stubborn. They do not have a fitting saddle so we have been riding him bareback. He was english trained once and we just trail ride. He is very smooth and sweet. The few times we have tried riding out of his field he tries to canter back to the stable. I know just hauling on the reins won't stop him. I have tried to turn him in a circle to stop him. When I do that he just turns his head sideways but keeps cantering on. If I pull him extremely hard in a circle I mess with his balance and he trips and almost falls. When we ride in the paddock he just moves up and down this one fenceline bordering the barn. I try to use my crop and legs to get him to the back of the field but nothing works. I sit back and steer but he just jerks his head down and canters back to one corner where he just stands. And when I turn him in a circle to stop he just trips. When he trips cantering I almost slide off. Can anybody help? Thanks so much.