I have a new horse. He is 13ish and green broke. When I brought him home I spent close to 2 months desensitizing him. I chose to use Clinton Anderson's method and worked with my horse atleast 5 days a week. He yields hindquarters and front end, backs, sends, squeezes between me and objects calmly and with confidence, self loads and circles. I started working on one rein stops and lateral flexion before I ever thought about getting on him. This is where the challenge begins. I started riding him too soon. We walked, trotted and canter without issue. He would stop when I picked up one rein but will not yield his head for a one rein stop. After I realized that this was an issue for him, I spent an entire week with him working on lateral flexion. After the week spent, he would yield both left and right with 2 fingers consistently, so I went back to work on yielding while in saddle. I was sitting on him, after saddling and desensitizing him, and had his head pulled 3/4 way around to the right. I was waiting for him to yield so I could release the pressure and he exploded. I was thrown off and will be out of the saddle for a while. Before putting him up that night, I did stand in each stirrup and ask for a yield but was too sore to get back on. Today, he yielded both ways on the ground with no issue. Any suggestions on how I accomplish this in the saddle?? I can't ride him with confidence until he is confident with lateral flexion!!