With Bonny Bonnello - The apex of the dressage training pyramid, collection is of the utmost importance for a dressage horse when it comes to performing expressive flying changes, half-passes, piaffe, and passage. Collection can be described as the shortening of your horse’s frame – not just his neck, but his complete longitudinal frame – and transferring more weight onto the hindquarters. But this shortening should not affect the forward rhythm.