I also own a Muscat grandson and posted a similar message a while ago but
didn't get much response. Guess there are not very many endurance riders with
Russian Arabs out there. It kind of supprises me since the little I know is
that the Russian lines are supposed to be very athletic. Although my horse is
relatively small (14.2h) he has powerful (but not big) hindquarters and does
a wonderful extended trot which really covers ground.