Have a 6 yr old gelding quarter horse who is generally pretty good, but still needs training. Just started to get him to lunge in the round pen and does good and follows every direction. The problem I am having is when riding my horse he will start to side pass when I want him to go straight. He will bend his neck in such a way that I cannot make him go in the direction I want him to. Im not sure what to do as I am new to training. This seems to happen at the ending of the rides or I take him in a direction he doesn't want to go. Any suggestions will help- Thanks!