The rein back is such a valuable exercise... It reinforces the rider's restraining aids as necessary, and engages the horse's hind legs - increasing the "sit" behind. Like any exercise, however, it must be done correctly to be beneficial. Learn how to do it here!
"It is not dressage that is difficult, it is making it look easy that is difficult. Some horses are born with presence, while others you can train presence. Either way, dressage is about improving the paces." ~ Carl Hester
From Facebook Fan Brenda Herzog ~ "When trying to sit the canter or trot, relax the legs down and around with each stride and to pick the horse "up" with you. This eliminates the bounce in your seat and helps to elevate the horse."
A rider's hands can only be as good as the arms they belong to.
Every time your horse spooks, remind yourself that horses in the wild that didn't spook at that rustling bush often got eaten by lions.