Big chance it does. Rien’s method respects the way in which horses learn and it’s developed in a way that your horse’s body will become stronger over time. He has been training horses for over 45 years and he’s never encountered a horse on which his method didn’t work.
However, not all horses have the same level of talent, so sometimes it can take longer for one horse than for the other to improve his level. But Rien says that every horse can give you a good feeling and it doesn’t matter how much talent he has.