Originally Posted by sarahver
OK I'm going to play this game again, please excuse my vernacular. Or lack there of.
Walk to trot: When the outside (front) leg is about to be picked up, I put my inside leg on the girth, hold my outside leg steady and (here is my terrible explanation) I just begin posting with the expectation of rising to the outside leg. Driving seat of sorts if you will.
Trot to canter: When the inside leg is about to be lifted (i.e. When I am in the sitting phase of a rising trot) I ask for bend with the inside rein, steady with the outside, open my inside hip/pelvic area, apply some heel (if necessary) behind the girth of the inside leg and hold the outside leg steady.
In the right frame of mind, Bobbie will pick up the correct lead simply by opening the inside hip angle. In the wrong frame of mind it takes some leg.
Getting there but where do you think you can more seamlessly use (with minor adjustment) use the SAME aids for all three gaits, relying on principally using the horse's body movement and knowing which hind leg to affect to change each gait.