Exerpt from the Perfect Back Suppling Exercises DVD by Caroline Lindsay, Mary Wanless explains the biomechanics of how the rider can use their own posture to help the horse work correctly.
"coming down in way that squashes him" the majority of dressage riders do this to their horses. The trend for rolled knee blocks help them to never worry about sitting too far back on the horse and there is now a epidemic of sore backed hollow backed horses whose riders can't ride big moving horses.
