Instructor Sibylle Wiemer has direct knowledge of this problem, as well as its misinterpretations. 'One frequently hears the term 'chair seat' to describe a riding position where people sit on their backsides and ride with very short stirrups'. That, however, isn’t the chair seat. In chair seat, the pelvis is so pitched that the rider tips back like he or she is sitting back on a chair or a sofa, the arms extended forwards and the feet pressing into the stirrups for stability. The knees are raised, and the rider’s feet are either under the knees or in front of them.