His impulsion originates in his hindquarters, and can be thought of as the invisible energy that causes the horse to move forward. Impulsion is as effective at the walk, as at the gallop, and should not be thought of as going fast. An effective visualization to explain the progression of the frame is this. The advanced horse, at FEI dressage level, is 10 feet, more compact and vertical in his movement than his less-experienced predecessor. Attempting to force a greener horse into a frame before he is ready is not advisable.
Experts say the basic training of a horse normally takes about two years.
Do not be lured by the number of gadgets and devices you may find in your tack catalogue, which can ultimately harm your horse and his movement if used improperly. Alas, there is no substitute for thoughtful and careful schooling, on a timeline that makes sense for your horse's physical and mental requirements. Just as the human athlete follows a regime of muscle development at the gym, so, too, must the horse. You only have one chance to make one horse balanced, supple and willing. With the proper planning and patience, it will happen, and the horse in the frame will be one that will bring you many moments of pride and pleasure.