I just bought a 3 year old paint a few weeks ago. He was slowly broken in a year ago. His previous owner did not ride him extensively, but did have him walking, trotting, and cantering last summer. He was barely ridden at all over this past winter. Now that I have been riding him, he will not trot when I ask him. I have worked on lunging him in his tack as well as making sure the girth is loose enough for him to feel comfortable moving around. He has no trouble trotting when I lunge him, and I make the typical 'click' sound and use the verbal command 'trot'. He responds fine to this when lunging. However, when I am riding him and ask for the trot, he just walks a bit faster and sometimes ends up stopping after I've asked a few times. I almost get the feeling that he is getting annoyed or confused with me. What should I work on with him to work on his trot under saddle?