Summer's reply is good advice Terri. I'm afraid that the rest of you are being taught to do waaaaaaay too much, with the risk of unbalancing the horse. I am having this problem at the moment with my working pupil Sarah, a very experienced young showjumper and eventer, but whose flat work had been typically taught to be rough and overdoing everything.She's getting better, riding the schoolmasters, but still, on the younger horses is trying to do too much, and stopping the flow.
The body movement that Perry describes would prevent my horses from performing it! Riders are so surprised when they get on the schoolmasters here, and almost just have to think walk to canter and it happens. When they try to do too much, the horse just says 'hey, fella, what am I supposed to think that means!'. We'll give Perry the chance to experience this when he comes down on the NR get together. (I haven't met Perry yet, but can imagine that by the enthusiasm that shines out of his posts, we'll have a camera handy to record the ear to ear grin!).
The outside leg should not be the predominant leg, for reasons explained in the next paragraph- it should merely brush back without any real pressure to indicate to the horse that it is the outside hind that you want him to move off with, so that he will be on the correct inside canter lead. It is the inside leg used in the normal position, with the toe level with the girth, that should be used with firmer pressure, to engage the inside hindleg and lift and lighten the inside shoulder to allow the horse to jump up into canter, not fall on his forehand and start to 'run' in trot.
If you ride a horse trained in lateral work as all of mine are, the outside leg used with pressure behind the girth means to move the quarters over, therefore, using the outside leg with pressure on a trained horse will cause a crooked canter strike off with the quarters coming in. The sooner the horse is trained to strike off to the inside leg, the sooner you will get good walk to canter transitions.
Heather