flamingorider wrote:
Your friends may have tack problems on top of their inexperience. Unfortunately beginners (especially in western country) tend to end up with cheap poor quality English saddles, which have poor balance. I've ridden in some where it felt like the saddle was fighting to put me into a chair seat. The other possibility is that their saddles are too narrow for the horses. That ruins the balance of even a good saddle, as well as being painful for the horse.

Haha, they can't use that excuse. They're riding my horse, with her saddle, and I have no problems with that saddle.