Originally Posted by AnitaAnne
Walk to canter transitions will help a horse to balance on the hind end better. It is easier to transition because they are both three beat gaits. Try to get the W-C trans first, then add the trot in the middle. It should help. Also can try walk-trot transitions with only about 4-5 steps, do this several times then instead of doing walk-trot-walk do walk-trot-canter. This is good way to teach horse to use back end better.
The walk is a 4 beat gait, not 3 beat.
Ensure that you have perfected your trot - canter - trot transitions before bothering with walk - canters. As MBP said above, rushing into a transition is due to a lack of balance. Work on basic transitions first, so halt - walk - trot - canter and back again. Also changes of rein, I would be riding serpentines and 'snowman' figures, and have shoulder in established before starting walk - canters. I like to have my horse sitting on it's haunches through the upward transition from walk - canter, if you've got it on the forehand you're just going to run it into trot then a fast, unbalanced canter.
I also like to have the horse cantering just off my hip/seat bones from a balanced trot. If you can pick up canter just by lifting your inside seat bone/hip, then the job is just about done to teach walk - canter, as the lift of the inside hip is a clear canter aid, rather than the pony club style throw the outside leg back and pull the inside rein.