If you would like to use a saddle it's important that it fits both horse and rider. There can be many different problems with a saddle and a poorly fitting saddle can causes many problems.
Just as a chair for office workers should meet health and safety regulations, so must a saddle be ergonomically appropriate.
A properly fitting saddle is an important link in achieving harmony between horse and ider. For the development of the muscles of the horse a saddle that fits properly is essential. It is also important that the saddle fits the rider and allows them to be properly balanced, so that the rider can sit easily on the horse.
Every horse is different and you have to find a tailor made solution.