Please help me understand the following 2 expressions. (1)Looking at a few dressage tests, I've seen references to "change rein", which is required both at the walk and at the trot. Can anyone explain what that phrase means? (2)In Heather's book, she makes reference to "riding on the right rein", which may be an English expression indicating when the right rein is the outside rein. Does the phrase "change rein" refer to changing your inside and outside reins(I notice that it is required at X in the dressage arena), so that one could say, e.g. "change from right rein to left rein", or am I mixing up two different things? Thanks.