Our lesson today revealed how to get a very good canter depart: it all has to do with the walk from which you depart. In walk, supple the horse 'til she is completely loose and giving then activate the hindquarters with a leg aid reinforced by a brush with the whip so that she steps well under herself with the hindquarters. From this walk, we can proceed into a beautiful canter depart- continuing to supple the canter as well.
Karen had me "canter up a hill" for as long as I could, by doing suppling exercises and activating the inside hind at canter. We then schooled medium canter with the focus, again, on keeping Delphi supple. The key is in the give-- I must not allow her to bear into my hand but rather keep her round and light. We got some fairly good medium canter and Delphi's canter is definitely improving.